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Blood Sweat Tears and Grease => Projects => Cafe Racers => Topic started by: cb250nproject on Apr 16, 2017, 01:57:48

Title: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 01:57:48
Hey All,

For a long time I have gained insight and answers by reading through the various articles here so I thought I would post a build thread here.

About 9 months ago I purchased a 1982 DOHC CB 750 F2, pretty sure it was an ex police bike as it had the charger wired in the paniers and the fact that the ex motorcycle cop that sold it to me told me it was pretty much confirmed my suspicions.

It was pretty tidy and for $3400 I couldnt pass it up, other than having a flat battery mechanically it was fine started it up and rode it home not a problem

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I already had a fair idea of some of the modifications I wanted to do in this build, one was the GSXR 750 front end upgrade, upgrade the exhaust, rear shocks, wheels, cam, carbs, rear hoop installation and the rest I found out as i went.

First of all i removed all of the fairing to see what lay beneath



Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 02:22:10
So after removing all of the fairing, airbox and fuel tank I noted the original rear shock were starting to show signs of rust as you would expect from a bike 30+ years but overall everything was looking pretty good.

The wiring loom that resembled an anaconda was something that i would look at slimming down at a later date/ the wiring never was pretty on these old Hondas (http://)

So I got onto Ebay and started hunting for a donor front end, it took a little while to find a set but i ended up getting a 2008 GSXR 750 front end that had the top and bottom tripple and axle for about $980

Next on the list was rims after looking around I decided to go with the Cognito Moto conversion hub, I picked up a rear spoked hub from and earlier model 750 that still had rear disc. both front and rear hubs were 42 spokes

The next challenge was to find rims to suit, I wanted to try and get a slightly fatter rear tyre on the back without blowing the budget out going crazy with the rims. For the front i ended up getting a 17" x 2.5 Morad brand new by the time i got it freighted here it was about $270, luckily i scored a second hand BMW rim that was 17" x 3.5 not as wide as i was hoping but for $42 i couldnt say no.

Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 02:45:26
So i sent the front hub of to get anodised as I found a place that could do it pretty cheap at home, while i was doing that I sent the rims away to get hydro blasted and powdercoated gold.

Originally I had planned for the bike to be all black except for the rims being gold with gold decals on the tank, but as it ended up turning out that wasnt the way it was going to be.

It took me a while to find the exact gold that I wanted I came across a company Prismatic Powders who offered a few different variants of gold I ordered colour swatches but after a few weeks didnt think they were going to arrive so I bit the bullet and ordered a a powder called prismatic gold unfortunately just after I received the powder the swatches arrived and I quickly realized that wasnt the colour I wanted, so I went with another colour Goldtastic which ended up turning out spot on

but i ended up going with a powder from prismatic powders called goldtastic, 
Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 04:03:03
Before starting the build i had done a bit of research and knew that the triple stem would need to be changed there seemed to be two options get a Cognito Moto one or look at fabrication one up, luckily for me the old man has a lathe and is always up for a challenge so we made some measurements and guesstimations

The bearings and races also need to be changed I found a conversion table online   

http://www.allballsracing.com/index.php/forkconversion

After looking here I went into a bearing shop and simply ordered the bearings i needed for less than half the price it was going to cost me to order them. The bottom races are fairly similar but the top race is thinner than the original Ive attached a photo so you can see for comparison

First I grinded off the stops from the bottom triple, then we pressed the original stem out from memory there was some sort of retaining pin and I think we heated it up a little, she was fairly stubborn but eventually came out in the press.

Next we measured the CB 750 stem against the GSXR stem to work out the difference then went to work on the lathe, i wont lie there were a few attempts before we got it right, you can see the original stem up top with the two failed attempts and the final in the lower triple

To press it in we put the stem in the freezer and i think we warmed up the lower triple before pressing it back in
Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 04:27:51
After the stem had been pressed in it was time to give it a test run.

Unfortuntely we miscalculated by about 4 mm so the thread of the stem was a few threads shy for the nut to go on properly, luckily the old man had anticipated it and left a lttle extra shoulder on the bottom of the stem so we pressed it out again and put it back on the lathe repeated the process and she came up sweet.

Im still to install new stops on the bottom of the triple.

When building this bike there was one underpining principle functionality over form, while having an asthetically pleasing ride was what I am hoping for safe comfortable rideability was what I was going for. so as much as low clip ons would look cool i ended up ordering some woodcraft 2.5" risers ( yet to arrive in the post )



 

 
Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 04:42:25
When I ordered the Cognito Moto conversion hub i opted to get all the spacers and bearings which we had to press in after I had the Hub anodised, just a FYI and something I learned by fu$king up unless it CNC billet aluminum anodising wont come out so good so when i went to get the rear hub anodised it ended up coming out a greyish colour (booo) it ended up getting sprayed out of a can.

For the rear hub i simply took the old bearings into the bearing shop and reordered the same.

After the front hub bearings had been pressed in i did a little mock up as we had the GSXR front end in the garage, and as advertised it fit like a glove
Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 05:01:03
Now that the Hubs were in order and the front end conversion was completed it was time to get the Hubs laced up, it actually took a little bit of searching to find someone to do it, finally i came across Bruce at Fastline Spokes

I had ordered some new front brake discs that arrived so i fitted them up then took the rims and Hubs to Bruce to be laced up and trued

While the hubs were away getting laced I figured it was time to look at installing the tail hoop. I had one in the garage that I had purchased for a previous build that i ended up not using.

First we worked out where the cuts were to go using the measure, measure and then measure again before cutting rule, after the cuts were made we used some smaller steel tube inserted into the frame as a lug. We then cut the hoop down to the required sized and welded it in place.

after looking at it ive realised that the hoop needs to be bent down about an inch this will be a little bit of an operation :/ and one yet to be done

the rims came back so i thought I'd just mock it up with the wheels just because there was nothing else i could do at the time
Title: Re: 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 16, 2017, 05:40:53
I ordered myself a Delvic 4 into 1 exhaust, then headed down to Pablos and got some tread onto the wheels ended up getting a 110 / 70 front and 150 / 60 Pirelli Diablo Rossi II.

at the same time I ended up finding some Hagons rear shocks on ebay for $150 so i snaped them up and mocked it all up to see how the bike would look.

i removed the wiring loom and original foot pegs, I ended up getting an Ultima wiring loom but that will be one of the last things to get installed

she sits pretty low :/ we will have to see how she goes i think i can get a few more mm out of pushing thr forks all the way through the triples

900 cams to come

 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 21, 2017, 21:38:50
Some stuff arrived in the mail, pity I'm at work

Ultima wiring loom

Woodcraft 2.5" risers

CBR 600 F2 coils
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Tim on Apr 21, 2017, 22:33:37
Wow!  Thanks for posting up the build detail - is this where you are now or is the bike complete?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 21, 2017, 23:03:46
Thanks Tim (my apologies for typo text on the phones starting to get a little too small to read these days), this is where i am now, working away for the next 5 weeks so once i get back home i will instal the cb 900 cam and hopefully get the valve clearances sorted, then the handle bars just to get an idea of the riding position.. then start to dream up the seat and tail end maybe look at making up some brackets to mount the rearsets.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 28, 2017, 02:06:03
I want to install an oil cooler can anyone point me in the direction of a supplier of a kit ??
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: spotty on Apr 28, 2017, 02:18:21
looking good, can't think of a finer thing to do to an old cop bike (who knows it may have been one of the ones used to nick me for something in days gone by...)

didn't CB1100's (and maybe some 900's) have a cooler stock? maybe search the info and see if any of the wreckers have got one somewhere.
 
theres plenty of a/market stuff out there for the actual coolers but getting the fittings, the wreckers might be your only option

are you using the old wheels? I might be interested in the front for my CB750K8 which already has CB900 forks but its going to be easier to use the 900 wheel and discs than try and get decent brakes and such to work with the stock wire wheel

where in (not so ) sunny Melbourne are you? i'm in Kalorama,  right on top of mount Dandenong so I get one of the best trips home every night after work, straight up the tourist rd
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 29, 2017, 07:31:05
Sweet spot to live in, mad roads up there I use to ride the black spur back on my little RGV 250 good times.

This is the front wheel I removed was going to off load it for $125 with discs there should be plenty on them but i wont be able to get the calipers on them until i come home in June. Im on the west side in the bronx of sunshine west  :-\

Got any photos of your build ? Im always interested in how peeps go about their builds

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 04, 2017, 05:40:19
ok so finally came home and tried to install the cb 900f cams (http://)

had a few mishaps along the way :/ two of the cam journal bolt broke off, a common occurance but none the less inconvenient.

has to drill and tap out new threads then when i reinstalled the bolts I added a little bit of antisieze  and then worked out the torque setting for wet bolts (different to the dry torque settings)

I was also unable to use the sprocket from the 750 cam which I tried to do because the sprocket was chamfered on the 900 cam and I was unsure how it would effect things. but the decision was ade easy when i realised it wasnt interchangeable.

then had to reshim to get the valve clearances right still need to find some 260 and 265 shims that will be tomorrows mission hopefully and ill put on the woodcraft riser clip ons on.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 06, 2017, 05:23:00
(https://uploads.tapatalk-cdn.com/20170606/5c7501c25a2d0b4648f902259d4c2b36.jpg)(https://uploads.tapatalk-cdn.com/20170606/46ee99b48972c1a93d5f5dbf7963ce52.jpg)

Went out and got studs to mount the rear disc that I had. Now just to make a spacer for the left side of the wheel.

Also got a chance to fit the 3" riser clip ons, it doesn't look as trick as low clip ons but it sure is comfortable. Tomorrow I'm hoping to get a start on the tail end see how that goes


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: brad black on Jun 08, 2017, 08:24:17
man, that rear disc is huge.  you need to cut it down and fit a smaller caliper.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: spotty on Jun 08, 2017, 21:13:02
man, that rear disc is huge.  you need to cut it down and fit a smaller caliper.

i'd leave the disc that size but replace with a matching one to the fronts or even just get it drilled so it looks similar, the solidness looks kind of wrong with the front drilled ones, and get rid of the black plastic thingy off the back of the caliper or put a matching 4 piston nissin on, the more brakes the better.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Jun 09, 2017, 19:33:37
Yeah, I think that black plastic thingy is just to keep water from getting flicked upward.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 09, 2017, 21:05:59
I agree the disc does look odd, would it be cheaper to get it drilled? or just buy a brand new disc?

Also im trying to work out exactly what model of cb 750 had the 6 stud bolt pattern for mounting that disc, the other ones I had were all a 5 stud bolt pattern, that was off the original wheel that came off. dont want to oreder the wrong one.. again

Given how little the rear brake does i dont think I will go to the trouble of putting a nissin caliper on, I have ordered a kit and was going to strip down and refurbish the original caliper. I think the brake upgrade that came with the GSXR fork conversion will still make it like night and day.. thats wat I'm hoping anyway
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 13, 2017, 05:07:23
(https://uploads.tapatalk-cdn.com/20170613/99b6eeb9cd8982ee07c3844afb55e796.jpg) so I'm mucking around with the tail part of the bike trying to get a rough idea of how it's all going to come together.
I've decided to add small side fairings to kind of finish it off... you're going to have to imagine it connects with the tail section and covers over the rear hoop...(https://uploads.tapatalk-cdn.com/20170613/d9adc46170b4dda01d7c16af090032e4.jpg)
It just looks kind of unfinished without the side fairing.

Although I've got all the gear to fibreglass it up I think I need to do a little more r & d on how best to incorporate the side fairings and also how the fairing is going to marry to the frame.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 14, 2017, 08:15:54
Really cool build! Following along for sure. I have a 900F that I plan on giving a similar treatment, although on a bit more of a budget so will be using CBR wheels instead of spoked ones and a 919 RWU fork. Nice to see the Delkevic exhaust on an F build, I've been eyeing that same one and it looks good! I like the way you're going with the rear!

Ground clearance seems like it could be a problem? Have you done the rake/trail calculations? From what I understand one drawback of the GSXR front end is the small offset in those triples that could lead to really low trail numbers. I'm no suspension expert, but that's what I've been able to gather. You might be able to kill two birds with one stone and get custom triples from Cognito that are raised/winged (to gain some ground clearance) and with something like a 45mm offset?

Btw, what is the total length of those forks?

Good luck with the build!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 15, 2017, 02:26:35
Hey Lights out

GSXR forks are 720mm with 17" rim the originals are 780mm with 19" rims, when I was looking into it i noted that CM offer a triple converion stem and bearing set, it ended up being a lot cheaper to turn one up on the lathe and grab the required bearings from a bearing shop. because CM offered the conversion stem i assumed (making an ASS out of U and Me) that it was all good and didnt check (rookie error).

I do intend to put a steering dampner on after a friend from MCR came unstuck on his tricked out cb 750. Im actullay only really concerned with the clearance or lack thereof :/ the Delvic pipes look sick but Im worried on a sweeping right hand corner it will be ground away. If worse comes to worse Dad just purchased a mill so maybe try to turn up an new triple if required

At the moment im trying to prepare the mould for the tail section I'm nearly happy with the shape I'll lay mesh over the mould before I pour the resin hopefully give it some more strength

see how we go, unfortunately my breaks nearly over :/ so the build will go on hold for 6 weeks booo

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 15, 2017, 05:33:59
The CBR900RR forks I'll be using are 732mm and I'll be using a 17" CBR/VFR front wheel (the Fireblade had a 16" but that's way too small). My 900F had the 18" front, but I assume frame geometry wasn't changed when they went to 18" from earlier years 19" so that probably wont't help me, I'll be in just 12mm better situation than you  ;D
With the CBR forks the original stem can be used, since Honda has been kind enough to use identical stems for a long time - so no conversion stem/lathe work or special bearings needed. Doesn't help the height or offset issue though :)

Darren Beggs (who built these (http://www.darrenbeggcustoms.com/?page_id=23) beasts) uses winged top triples to regain some ground clearance when using shorter forks. Here (http://photobucket.com/gallery/http://s33.photobucket.com/user/dbegg/media/RED%20CB1100F/DSCN2957.jpg.html) are some pics of what they look like.

Looking forward to progress on the seat/tail. Where will you be putting the battery? Will a small one fit under the hump?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 15, 2017, 07:11:27
Really cool build! Following along for sure. I have a 900F that I plan on giving a similar treatment, although on a bit more of a budget so will be using CBR wheels instead of spoked ones and a 919 RWU fork. Nice to see the Delkevic exhaust on an F build, I've been eyeing that same one and it looks good! I like the way you're going with the rear!

Ground clearance seems like it could be a problem? Have you done the rake/trail calculations? From what I understand one drawback of the GSXR front end is the small offset in those triples that could lead to really low trail numbers. I'm no suspension expert, but that's what I've been able to gather. You might be able to kill two birds with one stone and get custom triples from Cognito that are raised/winged (to gain some ground clearance) and with something like a 45mm offset?

Btw, what is the total length of those forks?

Good luck with the build!

The forks are about 720mm long with 17" rim as opposed to the original 780mm with a 19" rim  that was on it.

I'm not too sure of how the numbers work out, we fabricated a new triple stem and pressed it into the original GSXR triple, cognito moto also offer a replacement triple stem also but it was a lot cheaper to turn it up on the lathe ourselves.

I'll have to see what she rides like definitely need a steering dampener after talking to a mate from MCR who came off his cb750 from tank slapping, although his was a monster bored out and Dyno tuned.

If worse comes to worse Dad just got a mill (https://uploads.tapatalk-cdn.com/20170615/1bf5c55b88e76d849ed35efa6d3191fd.jpg)
Which I reckon he is dying to use, will definitely be fabricating the rear set brackets with that.

Managed to snap up a few more goodies on line (https://uploads.tapatalk-cdn.com/20170615/3740af7986df27fa5dfca59d4b96537a.png)

So now Frankenhonda II will have some lungs

Today I've been trying to mould the seat pan up ready to

Those are some trick beasts.

I think once I put the fibreglass on the tail section and get that sorted I will make up a seat pan also. I was unable to put the resin and glass on because I had nothing to use as a release agent...poorly prepared.

There's some kick ass small batteries but I'm unsure which ones are best.

Just got some of these too (https://uploads.tapatalk-cdn.com/20170615/283ea4b4e16b3b2812dea1a77af6cb80.png) but I don't think they will arrive before I leave.

You'll have to show us some shots of your build


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 15, 2017, 22:33:27
Today I fibreglassed the tail section.

First I made a mould basically I used some foam for the tail section and cardboard for the seat pan
(https://uploads.tapatalk-cdn.com/20170616/4ac580705a3a85b58bb8949eb1a9cf8e.jpg)

Then i taped the lot up so it wouldn't stick and also the tape give a much smoother finish than my bread knife made cuts.
(https://uploads.tapatalk-cdn.com/20170616/42acfc23923f4c135d2572892227eaf6.jpg)

I then put mesh over my mould to give the fibreglass a little more rigidity, but unfortunately I did not put wax on the tape as a releasing agent. So after getting it all nice and tied into place I removed it,waxed it up,then reinstalling the mesh
(https://uploads.tapatalk-cdn.com/20170616/b6f7cc7154b70c28b4e5837d6f90047a.jpg)

Then I cut out my sheets of fibreglass I used two different kinds one that is a cloth and the other a fibreglass matting. I think the matting is stronger but the cloth gives a nicer finish (https://uploads.tapatalk-cdn.com/20170616/25b09e11e01944f8cc1874bd0d3e1a67.jpg)

Then I used a plastic sheet to cover the rest of the bike (https://uploads.tapatalk-cdn.com/20170616/4d14df9a8c6b93431f363b10bb2312de.jpg)

Then lay the resin on and fibreglass (https://uploads.tapatalk-cdn.com/20170616/89d78121df9ff9e61eee590a36652efc.jpg)(https://uploads.tapatalk-cdn.com/20170616/a0265acf3322c8b577368630ad1c294a.jpg)

Now to wait for it to dry



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 16, 2017, 05:00:58
Damn, those CRs are sexy! Fibreglass work looks good, giving me lots of good ideas here :)

I will start a thread once my build is properly underway. At the moment I'm planning and gathering parts... and (slowly) working on a GS550 build.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 16, 2017, 05:48:00
We'll progress was slow and I'm all out of filler

(https://uploads.tapatalk-cdn.com/20170616/121219f5aa0ec62ecb9140c890ff8f56.jpg)

I think I have the shape right tomorrow I'll go and get more filler and some more sand paper

(https://uploads.tapatalk-cdn.com/20170616/47a1bd2bddce905fafbe64a33b2c78a3.jpg)
(https://uploads.tapatalk-cdn.com/20170616/a5eb8e7140ec889c94f046bc91426d04.jpg)(https://uploads.tapatalk-cdn.com/20170616/f511790ec2758ab9b6328775b74c4cac.jpg)(https://uploads.tapatalk-cdn.com/20170616/faf831ace46667364f5ddd6aca3e2f62.jpg)
(https://uploads.tapatalk-cdn.com/20170616/fa8cabf5ed1d00b96f7ff8b277ebd529.jpg)(https://uploads.tapatalk-cdn.com/20170616/110829dc5d8d9436179bee36434aeb6f.jpg)

Let's see how many runs I can get on the board tomorrow


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 17, 2017, 06:39:15
Ok so I cut it out and she's a little rough (glass half full optimism)

She still needs a lot of work and I need to get a contour gauge to help me get the shaping spot on
(https://uploads.tapatalk-cdn.com/20170617/bd60ed25afc35a18e2524b3f158b432a.png) hopefully this tool allows me to get the clean finish I want as paint only highlights your imperfections.

(https://uploads.tapatalk-cdn.com/20170617/e5bc4f3d9ec3a24b58890e809db44294.jpg)(https://uploads.tapatalk-cdn.com/20170617/03dbcdd1fdccb9a4647ab650d5d80427.jpg)

You can see where I cut too much off on the front left near the tank I'm not happy with that line and need to fix it up (https://uploads.tapatalk-cdn.com/20170617/9aea7705859087e9232d8f628c80e051.jpg)

(https://uploads.tapatalk-cdn.com/20170617/bd0e0610ba53c08a4bbb713ef8564686.jpg)(https://uploads.tapatalk-cdn.com/20170617/0f6bbd982fc73f16f1325036df5a4b15.jpg)(https://uploads.tapatalk-cdn.com/20170617/1a6f9b8cbed3d6a18735d8cbb711bc80.jpg)(https://uploads.tapatalk-cdn.com/20170617/69e2e18d7b298720a65771b9893a7fbe.jpg)

So that's where I'm at it's a long way from where I want to be but hopefully I can make it work


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: brad black on Jun 17, 2017, 10:12:10
I agree the disc does look odd, would it be cheaper to get it drilled? or just buy a brand new disc?

Also im trying to work out exactly what model of cb 750 had the 6 stud bolt pattern for mounting that disc, the other ones I had were all a 5 stud bolt pattern, that was off the original wheel that came off. dont want to oreder the wrong one.. again

Given how little the rear brake does i dont think I will go to the trouble of putting a nissin caliper on, I have ordered a kit and was going to strip down and refurbish the original caliper. I think the brake upgrade that came with the GSXR fork conversion will still make it like night and day.. thats wat I'm hoping anyway

you could ask max at planet discs.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 18, 2017, 03:31:35
you could ask max at planet discs.

Cheers Brad I'll probably touch base with them next break


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 18, 2017, 03:43:35
So I'm trying to take a more measured approach.

So I drew up a centre line and a few other points of reference (https://uploads.tapatalk-cdn.com/20170618/ca6117caa643ed022b98d3219cdbe2a3.jpg)

As you can see it took me a couple of attempts to get it where I wanted to (https://uploads.tapatalk-cdn.com/20170618/092debff9f39b99729012e389c1a9ec4.jpg)(https://uploads.tapatalk-cdn.com/20170618/14db4b82f11ebc3b25f5fdf038420506.jpg)

Once the lines were drawn I cut it all as close to the desired shape as I could (https://uploads.tapatalk-cdn.com/20170618/b35233b7e0c5d43f59ef08f854b47f7f.jpg)

Next thing I did was go to work on the left hand side of the seat pan didn't mould to the chassis rail it was bowing out a little in two spots and was doing my head in so I cut them out the redid the left side (https://uploads.tapatalk-cdn.com/20170618/467c8f755dea1e75d98af0f46da4c78d.jpg)
(https://uploads.tapatalk-cdn.com/20170618/3ba5a8744cc9b23dbe1dd98d7df163a1.jpg)

You probably can't see the difference in the before and after but it follows the contour of the tail around much better.

Once the resin dries I may have to build it up wit a few more pieces of fibreglass just to get it sweet.

In addition there are a few spots that will need to be filled in and levelled out then I'll look at cutting the slot in for the rear tail light LEd strip and I'll have to weld a support bracket for the hump in the tail




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Jun 18, 2017, 21:53:20
Great bike! The joy of fiberglass is you can keep adding or removing it until you get the shape you want. You just need time and motivation!!!!! For me that rear disc is spoiling the good looks, drilling some holes to match the front ones might help. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 19, 2017, 07:56:16
Great bike! The joy of fiberglass is you can keep adding or removing it until you get the shape you want. You just need time and motivation!!!!! For me that rear disc is spoiling the good looks, drilling some holes to match the front ones might help.
I agree wholeheartedly the disc needs to be drilled. I'm away at work now for the next six weeks but once i return ill look at going somewhere to get someone to drill it out, my seal kit for the rear caliper came in the mail today (https://uploads.tapatalk-cdn.com/20170619/017edb31e3ccd3aba47be1faeb0c8d4c.jpg) so i will strip it down repaint it and refurbish it will be a good opportunity to take the disc of and sent it away.

Still have a few other things to nut out now also kike the speedo i had a cable one left over from a previous build but i just realised with the CM hub and spacers i used there is no room for a speedo, so ill have to find some other option with the guages less is more for me small and unobtrusive. Guess ill be scouring the net for options while im at work.

The fiberglass depending on how the ocd is could take longer than anticipated 😕 but it was never meant to be easy, honestly i wish i was an accomplished welder steel seat pans and tails look trick, but unfortunately thats a skill im yet to master so fiberglass it is

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 20, 2017, 06:02:09
Fiberglass work looks really good in the pictures at least!

Don't recall where that rear disc was from, but some (old Hondas) are apparently really hardened so get some good drill bits :)

Re speedo, aftermarket ones like Koso use a magnetic sensor you mount to the one of the brake caliper nuts. That's a clean and minimal solution. Believe they read the tach from the coils as well so that would eliminate the tach cable from the valve cover as a bonus.

...or I've seen some get a sensor from e.g an F3 CBR which reads from the front sprocket. That would require a custom machined or at least modified sprocket cover for mounting though. Google 'dons cup of gold' for a build with that solution.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 20, 2017, 07:25:11
Lol good from a far but far from good, it will need some TLC when im home next.
Those koso speedos look pretty trick have you used them?

Today the CR carbs arrived in the post today 😆 pretty happy about that, now im just waiting on some shims so i can finish the valve clearances, reseal the engine and give it a good glean up... then onto wiring not ny Forte at all.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 20, 2017, 07:33:04
Haven't used the Kosos myself, but only heard good things. Will probably be going with them when I get going with my build. Seems like a quality brand. I believe Acewell uses similar setup too.

Remember to set the valve clearances to .005-.006, not down to .002 as the FSM says. At least that seems to be the collective wisdom of the 1100f.net forum :) Too tight especially on the exhaust side risks burning the valves.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: brad black on Jun 20, 2017, 09:09:23
i had max make me a disc recently, i think it was all water cut, even the holes in it.  not sure how thick the original is, but you could get it made thinner too from stainless, 4mm is fine.  and a bit smaller, to take a smaller caliper.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 21, 2017, 06:18:44
Haven't used the Kosos myself, but only heard good things. Will probably be going with them when I get going with my build. Seems like a quality brand. I believe Acewell uses similar setup too.

Remember to set the valve clearances to .005-.006, not down to .002 as the FSM says. At least that seems to be the collective wisdom of the 1100f.net forum :) Too tight especially on the exhaust side risks burning the valves.


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Ill have to check out Acewell also, yea i too scoured over the forums and came to the same conclusion as you and left min .006 i think better to have too much than not enough may sound shit but wont fuck the valves.

Hopefully all the shims are ready would be cool to put them in fit the carbs and see if i can fire her up  (very wishful thinking) i really want to hear the Delvic pipes.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 21, 2017, 06:19:16
Haven't used the Kosos myself, but only heard good things. Will probably be going with them when I get going with my build. Seems like a quality brand. I believe Acewell uses similar setup too.

Remember to set the valve clearances to .005-.006, not down to .002 as the FSM says. At least that seems to be the collective wisdom of the 1100f.net forum :) Too tight especially on the exhaust side risks burning the valves.


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Ill have to check out Acewell also, yea i too scoured over the forums and came to the same conclusion as you and left min .006 i think better to have too much than not enough may sound shit but wont fuck the valves.

Hopefully all the shims are ready would be cool to put them in fit the carbs and see if i can fire her up  (very wishful thinking) i really want to hear the Delvic pipes.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 21, 2017, 06:19:45
Haven't used the Kosos myself, but only heard good things. Will probably be going with them when I get going with my build. Seems like a quality brand. I believe Acewell uses similar setup too.

Remember to set the valve clearances to .005-.006, not down to .002 as the FSM says. At least that seems to be the collective wisdom of the 1100f.net forum :) Too tight especially on the exhaust side risks burning the valves.


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Ill have to check out Acewell also, yea i too scoured over the forums and came to the same conclusion as you and left min .006 i think better to have too much than not enough may sound shit but wont fuck the valves.

Hopefully all the shims are ready would be cool to put them in fit the carbs and see if i can fire her up  (very wishful thinking) i really want to hear the Delvic pipes.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 21, 2017, 06:21:05
i had max make me a disc recently, i think it was all water cut, even the holes in it.  not sure how thick the original is, but you could get it made thinner too from stainless, 4mm is fine.  and a bit smaller, to take a smaller caliper.
Hey brad what am i looking at to get a disc done roughly?

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jun 21, 2017, 07:34:37
Hopefully all the shims are ready would be cool to put them in fit the carbs and see if i can fire her up  (very wishful thinking) i really want to hear the Delvic pipes.

Now that's something at least I would like to see/hear a video of :)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: brad black on Jun 21, 2017, 08:01:04
Hey brad what am i looking at to get a disc done roughly?

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dunno.  i would have got a trade price plus i had some other stuff done and i don't recall what it ended up being.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 22, 2017, 00:19:19
I just messaged the seller for my CR carbs to see what tgey came off, as luck would have it a CB 750 and it was just jetted and tuned hopefully its pretty close to spot on once fitted

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jun 22, 2017, 03:16:12
You shouldnít have to do much with the carbs.  Mine were pre-jetted and it runs like a top.  Just needed a sync.  I read earlier that you may need a steering stabilizer.  I can attest to this, mineís pretty twitchy without it.  I have a cbr954 front end on it. I ended up buying a ohlins that came off the ninja and had it re-valved.  It cost me a total of $200 with the re-valve.  It was definitely worth it.  It looks good man.  I canít wait to see when itís finished.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 22, 2017, 04:46:36
You shouldnít have to do much with the carbs.  Mine were pre-jetted and it runs like a top.  Just needed a sync.  I read earlier that you may need a steering stabilizer.  I can attest to this, mineís pretty twitchy without it.  I have a cbr954 front end on it. I ended up buying a ohlins that came off the ninja and had it re-valved.  It cost me a total of $200 with the re-valve.  It was definitely worth it.  It looks good man.  I canít wait to see when itís finished.
Thats cool do you have photos of the dampener installed ?

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jun 22, 2017, 13:12:12
Not currently. Ill try to take some tonight. I had a tab welded to the steering stop off the steering neck and a stabilizer clamp on the fork.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 22, 2017, 18:05:16
Not currently. Ill try to take some tonight. I had a tab welded to the steering stop off the steering neck and a stabilizer clamp on the fork.
Awesome always interested to seebhow others overcome these issues, how much shorter were the forks you put on compared to stock, i think there was 4cm difference in length between stock and gsxr.

I was looking at second hand gsxr dampners can puck them up fairly cheap, then for shits and giggles typed in ohlins 😨 get what you pay for i guess, be a bit out of my budget.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jun 22, 2017, 23:05:11
I think my shocks are the same length as yours. They should be the same as a gsxr.  I believe theyíre 27.5Ē in length.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 23, 2017, 22:57:11
Esmoojee your bike looks sweet as, The mono shock and swing arm conversion with that seat looks pimp finished professionally ill be happy if mine is half as sweet 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jun 24, 2017, 12:49:51
Thanks man, it took me a long time.  I still keep making upgrades.  I took her out on Mulholland drive yesterday and had a blast.  However, I think Iím getting too old for clip ons.  I decided to switch to my 3Ē hi-rise clip ons over the cbrís.  I switched out my foot pegs recently as well to gsxrís over the yamahaís.  Itís a constant project but itís fun.  Iím considering swapping the front end to a yamaha r1.  I have an extra lying around.  I canít decide.  Keep up posting pics.  I like to see other cbíers bikes.  I have an affinity for them.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 25, 2017, 01:18:58
Thanks man, it took me a long time.  I still keep making upgrades.  I took her out on Mulholland drive yesterday and had a blast.  However, I think Iím getting too old for clip ons.  I decided to switch to my 3Ē hi-rise clip ons over the cbrís.  I switched out my foot pegs recently as well to gsxrís over the yamahaís.  Itís a constant project but itís fun.  Iím considering swapping the front end to a yamaha r1.  I have an extra lying around.  I canít decide.  Keep up posting pics.  I like to see other cbíers bikes.  I have an affinity for them.
With the R1 pegs did yoy weld brakets on to mount them ? Im jealous that you get to ride Mulholland ive watched heaps of clips fmof that

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jun 25, 2017, 14:35:54
No, I cut down the original peg brackets and drilled and tapped them.  No welding required.  All bolt on.  Mulholland is fun, Angeles crest hwy is just as fun too!  Itís actually closer to where I live. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jun 26, 2017, 05:16:18
No, I cut down the original peg brackets and drilled and tapped them.  No welding required.  All bolt on.  Mulholland is fun, Angeles crest hwy is just as fun too!  Itís actually closer to where I live.
You inspired me

(https://uploads.tapatalk-cdn.com/20170626/5bc26d87d11f1dfe7c4e8caad24473ab.jpg)
(https://uploads.tapatalk-cdn.com/20170626/b8e0842a0ff1da089e3e7d2eb866b246.jpg)

My old man is looking for an excuse to test out the new mill so ive ordered the rearsets came with master cylinder and calipers not sure if ill be able to use the caliper or not have to sus it out when i get home.

Did you end up getting a chance to take a pic of the dampner set up ? Id love to see what you did to those peg brackets also 👌no just trying to work out what dampner and bracket to get i cant remeber the diameter of the fork tube :/

I was looking at Dakota speedos but theyre a little cost prohibitive
(https://uploads.tapatalk-cdn.com/20170626/4e48c6de6e12dccf1144984d0bf2fee2.jpg)

But oh so sweet looking. Think ill have to keep scouring the net for options but.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jul 03, 2017, 20:42:00
So while I'm stuck up the mountain at work Ive been scouring fleabay for some additional parts required and managed to find myself a Ohlins steering damper for about $200, and an aluminium front mud guard from Kickstarter.de.

Ive been watching youtube and found this cool clip https://www.youtube.com/watch?v=WWUEAMmfgVU and Im hoping to make brackets for the front mud guard in a similar fashion, although this guy is a pro so im anticipating it taking a few attempts to get it spot on.

although Ive got the steering damper I'm still not quite sure where exactly will be the best place to mount it so its most effective any people out there who have done it previously on the cb 750 dohc that have any photos it would be much appreciated.

My goal is to have all of the seat pan, tail section and frame work done with valves reshimed so I can seal engine back up this next break. then i will strip the frame down to paint it.

The engine will need a bit of loving what does everyone do to clean it down ? most of it i wil just spray silver but i will polish up the clutch basket cover and rotor cover.

the things that are stil baking my noodle is what guages to use, and what im going to do with the headlight/ nose cone option. got a few ideas but nothing in concrete yet.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jul 04, 2017, 06:18:17
 Nice score on the dampener and fender!

No personal experience from mounting steering dampener, but seems most common to mount it off on the right hand side just under the tank. Cleanest solution is in imo in front though, and since you have a 750 and therefore no oil cooler you have the space for that. Guess you'd need to either source or fab a mount to support it?

For engine cleaning - degreaser, wire brush and elbow grease? ;)

For covers etc that come off, media blasting if you have that available? (Blasting cases seems like a bad idea)
(https://uploads.tapatalk-cdn.com/20170704/930195d076fcef3747c234ecf2cda13a.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jul 04, 2017, 06:50:06
Nice score on the dampener and fender!

No personal experience from mounting steering dampener, but seems most common to mount it off on the right hand side just under the tank. Cleanest solution is in imo in front though, and since you have a 750 and therefore no oil cooler you have the space for that. Guess you'd need to either source or fab a mount to support it?

For engine cleaning - degreaser, wire brush and elbow grease? ;)

For covers etc that come off, media blasting if you have that available? (Blasting cases seems like a bad idea)
(https://uploads.tapatalk-cdn.com/20170704/930195d076fcef3747c234ecf2cda13a.jpg)


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Thats a crazy set up for the damper, a mean feat of engineering. I agree trying to put it up front will make it look better ill see how technical i can get.

I had a funny feeling there was no real easy way to clean the engine i guess ill have to get an assortment of wire brushes and pipe cleaners and hook in hopefully this break i can put in a few solid weeks of work.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Jul 04, 2017, 13:55:10
I actually think that particular mount is a kit from Japan. Don't know the details or if it's available, might be worth checking?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Jul 05, 2017, 22:49:01
Sorry man, I was wrong about the weld. That was on my nighthawk. The 750 I just drilled and tapped in the steering stop.  I canít really get in there to get a good photo.  I canít remember if itís 6 or 8... Whatever the standard mount bolt was.  I locked it down with thread lock and lock nut. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jul 06, 2017, 16:15:19
Sorry man, I was wrong about the weld. That was on my nighthawk. The 750 I just drilled and tapped in the steering stop.  I canít really get in there to get a good photo.  I canít remember if itís 6 or 8... Whatever the standard mount bolt was.  I locked it down with thread lock and lock nut.
Now thats a cool idea because the bottom triple clam on the front left side has a mounting point for the damper i reckon. Hopefully the damper i got is not too long, as that would be a nice discreet place to mount it.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jul 07, 2017, 07:50:15
i was looking through my build photos and cam across a photo of the triple, im wondering if the damper will fit like you said from the stopper to the preexisting mount on the lower triple.

I just hope the 63mm stroke is correct sucks not being home so i can try it out.

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jul 16, 2017, 03:10:41
So the front guard arrived in the post and my wife was kind enough to show me what it looks like on the bike... although its not in the correct position give me a fair idea.. im thinking painting it all black so as not to draw much attention. The fun part will be fabricating the mountin brackets

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 04, 2017, 05:00:44
So I've been home a few days and finally got to get into my shed I decided to carry on fixing the many imperfections with the seat (https://uploads.tapatalk-cdn.com/20170804/14f8798dfd49d7356c391493d42597b7.jpg)(https://uploads.tapatalk-cdn.com/20170804/3833ab30be4899791005240eadf437b1.jpg)(https://uploads.tapatalk-cdn.com/20170804/fa7857142333d4fb15e18a0f3da4e8f5.jpg)(https://uploads.tapatalk-cdn.com/20170804/928293caf4e72f7f1d2b9ef1df450534.jpg)

I marked out the place I would be cutting out to flush mount the rear LED brake and indicator strip
(https://uploads.tapatalk-cdn.com/20170804/aa32c70999d56545052ae7a7aaeb0406.jpg)
I then thought I'd play around with the Daytona digital speedo and idiot lights I'm thinking I will mill out a hole in the top triple to flush mount the idiot lights
(https://uploads.tapatalk-cdn.com/20170804/f6dd1e5f22ad4a515c2a0239f0006fad.jpg)(https://uploads.tapatalk-cdn.com/20170804/c7769760d34c78cd9615ab1daa3a22b6.jpg)(https://uploads.tapatalk-cdn.com/20170804/39b72c6330c5c6f2108727019b256917.jpg)

I then unwrapped the front guard I got from flea bay to see what it would look like I think I will paint it satin black so as not to draw attention to it(https://uploads.tapatalk-cdn.com/20170804/7be09f737dd19103692fc48f686e95af.jpg)(https://uploads.tapatalk-cdn.com/20170804/a7aa9bd244374d60ba245fc5e264effb.jpg)(https://uploads.tapatalk-cdn.com/20170804/a22746f6d1b1e7373004d6aca7b76cd7.jpg)

I'm getting a mig welder tomorrow so I'm going to see how I go fabing an electrical tray I'm anticipating it being a little ugly


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 07, 2017, 08:15:03
(https://uploads.tapatalk-cdn.com/20170807/1cf51589c77d8397d9bd1fce415d107f.jpg). So going to try and modify this triple clamp to house the idiot lights and also take out the section where the key would normally go to house the speedo so it also sits flush with the top of the triple.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 11, 2017, 03:33:28
Ok so it was one of those days where you have to clean the shed before you can start working in it.

So I removed the engine in preparation of spraying it and the frame.

So these are all the bolts I had to remove from the frame

(https://uploads.tapatalk-cdn.com/20170811/d89e9501f27ebf17078b2a25dc1644f4.jpg) (https://uploads.tapatalk-cdn.com/20170811/ed35ef055b5d3152d74b27d37291cd24.jpg)(https://uploads.tapatalk-cdn.com/20170811/671c858eedddd069393ad4aa89e20820.jpg)
be sure to completely remove this bracket as it gets in the way if you try to remove the engine with it still in place
 (https://uploads.tapatalk-cdn.com/20170811/24181b941748142a2978e9541ce508e0.jpg)(https://uploads.tapatalk-cdn.com/20170811/a84765036ad6f4872e9cfc7f5fa319cd.jpg)
then I removed these front engine mount brackets be sure to remove both of this completely also it's a pain in the ass trying to balance an engine that is half out whilst trying to fish out the right sized ratchet.
(https://uploads.tapatalk-cdn.com/20170811/77f2c3d1ea4bd09fdce702155e88a389.jpg)
the two on the right side at the front and one just behind the clutch there once those two are out the sub frame comes out
(https://uploads.tapatalk-cdn.com/20170811/c6b6e834c3e046af6ec09b8a16ec86ef.jpg)
The next bit involved a few F bombs and a lot of manoeuvres of which I could not recall exactly even if I wanted to
(https://uploads.tapatalk-cdn.com/20170811/c8afcc0d8986e7cb4f56deaeb2c45420.jpg)

(https://uploads.tapatalk-cdn.com/20170811/dbe0891e58c95af283d78f23cf762ca9.jpg)

Now for the fun part degreasing then stripping it back to get ready for painting (https://uploads.tapatalk-cdn.com/20170811/f9a347a8d5ab85949dce4a667e314103.jpg)(https://uploads.tapatalk-cdn.com/20170811/b4f3bfc063d4f64793fd7cdde07ca710.jpg)

Now I'm out of degreaser so I'm pulling up stumps I painted up some of the parts now waiting for everything to dry (https://uploads.tapatalk-cdn.com/20170811/f5e714d429eae39a1df57ad401f0ce7f.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Aug 11, 2017, 16:13:23
How have I not seen this thread ?  Looking great !!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 11, 2017, 16:33:26
Good progress! Nice work getting the engine out. Good practice for getting it back in without scratching paint :P

Painted covers look great. Did you just degrease and clean or wirebrush/sand as well?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 11, 2017, 23:53:51
Yea degreased, paint stripper, wire brush, sandpaper then mineral turpentine and finally the wax and grease remover. Surprising how long it takes to get it back to where you want it not looking forward to all the fins on the engine.

I've doused the engine with degreaser so later this arvo I'll try to sand back the frame and paint it up (https://uploads.tapatalk-cdn.com/20170812/b0b364a1562c4272e614079c26779887.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 12, 2017, 05:03:41
So I made a few more runs, late start today had to attend pre natal class gonna have to get this project near completion over the next week (https://uploads.tapatalk-cdn.com/20170812/546831ec6a6f6f2901a74af5f8830c0d.jpg)(https://uploads.tapatalk-cdn.com/20170812/52d4bc152f30d1cab1b0bf95097dab03.jpg)(https://uploads.tapatalk-cdn.com/20170812/036cc4b6aab93433742702fa495d66c1.jpg)(https://uploads.tapatalk-cdn.com/20170812/db721baafcf2b5639137caedd97bad02.jpg)(https://uploads.tapatalk-cdn.com/20170812/96bb5c3f0bfcf086bab589cce6e7670c.jpg)

The garage looks like a bomb just went off but I think that's still classified as progress


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 12, 2017, 06:46:45
Few more runs on the board before dinner got everything in paint stripper ready for tomorrow (https://uploads.tapatalk-cdn.com/20170812/8b7a7c5f45675dcef30d120701f8e744.jpg)(https://uploads.tapatalk-cdn.com/20170812/469c981182ec9a17791329c1571099f6.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Aug 12, 2017, 18:08:16
gonna have to get this project near completion over the next week

Errr  I hope you meant week(s) You are making great progress, but....... You will end up frustrated and hating the bike if you push too hard. Good luck and keep up the great work  :) I wish you both well for the big day  :-*
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 12, 2017, 19:56:42
Lol it's true, I'm fly in fly out so I have a full 84 hrs primary focus is to get frame de tabbed, stripped and painted and engine striped and repainted then back in the frame so she's rolling again anything after that is a bonus hopefully the seat will also be finished
(https://uploads.tapatalk-cdn.com/20170812/8270393fb3cd0c2fb38d538b3939a4eb.jpg)(https://uploads.tapatalk-cdn.com/20170812/282fa52ebd55b63d12c29e1c14455eeb.jpg)
Paint stripper didn't work as well as I had hoped, apparently if you wrap it in foil dull side down it's more effective so I'm off to get some more stripper then back to it

Dogs are walked and fed washing done and hung out should have a full day at it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 13, 2017, 00:06:24
I spoke too soon apparently there is a BBQ we have to attend

(https://uploads.tapatalk-cdn.com/20170813/b61f1707244e8e99e58e5b60cc57fc5a.jpg)
First I gernied all the parts down to see what was left to get off (https://uploads.tapatalk-cdn.com/20170813/f46380a9f06f6a3509f01fbf0374cc7c.jpg)
I'm not convinced the foil made any difference
(https://uploads.tapatalk-cdn.com/20170813/f1ea673a4cbc536ea01adc6ad2971f69.jpg)
Putting rust converter on after I hit the pieces with the wire brush
(https://uploads.tapatalk-cdn.com/20170813/d48073db55c44d7b64eb9199474ed433.jpg)(https://uploads.tapatalk-cdn.com/20170813/6d5380c8b9c29bd87f3930bb4dbd6265.jpg)(https://uploads.tapatalk-cdn.com/20170813/f952813e7ec7507ec0d118de9666400e.jpg)(https://uploads.tapatalk-cdn.com/20170813/1ec2d7c4ffea362b202ffa4ccb3e325f.jpg)

Then onto the frame
(https://uploads.tapatalk-cdn.com/20170813/8e4b3139ae2eb55e802311c22a09f8d4.jpg)

Thais is as far as I got (https://uploads.tapatalk-cdn.com/20170813/ecc02c9936d9160690c0ac335594e163.jpg)(https://uploads.tapatalk-cdn.com/20170813/01bdc2f3fcc2a3498ec27a3ed9e09858.jpg)




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 13, 2017, 04:39:12
Keep in mind, a little shit left on there is gonna come off when scuffed up for the paint job anyhow. What are you painting with?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 13, 2017, 04:54:55
Yea I'll have to give it a scuff to smooth it out after the rust converter

(https://uploads.tapatalk-cdn.com/20170813/92862aa2ca4f22c27ff958a6870abe84.jpg)

Unfortunately spraying isn't going to be too tech so I thought I'd use this

(https://uploads.tapatalk-cdn.com/20170813/f0a2529a46072fa1ba732d1ee586fa67.jpg)(https://uploads.tapatalk-cdn.com/20170813/b981e9e0c2b0b48cacf8eea4ffe956b2.jpg)(https://uploads.tapatalk-cdn.com/20170813/d26e17af34d34e73a9e47d24be32c368.jpg)

This is the evolution of the frame batteries for the drill are both flat waiting for it to charge so I can finish the job and get the rust converter onto it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 13, 2017, 05:47:25
(https://uploads.tapatalk-cdn.com/20170813/f6766277b8a345e9d4873ea91c337005.jpg)(https://uploads.tapatalk-cdn.com/20170813/b89cf422da727f18cc7041ee4d77e9b4.jpg)

That's where I finished up at everything in rust converter tomorrow I'll rough it up and spray then get onto the engine


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 13, 2017, 07:22:01
Fwiw I keep hearing good things about appliance epoxy for frames.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 13, 2017, 07:46:48
yea i figured if its good for roll cages it should be fairly durable. That said im still paranoid of scratching the frame when i  reinstall the engine.

Im thinking about bubble wrapping the frame when i go to in to install the engine, not sure how far ill get tomorrow as Im heading across town to my dads to have a crack at modifying the triple clamp on the mill to house the speedo and idiot lights.

If we get enough time we will try to make up some adapter plates so that the R6 rearsets can mount im thinking of using the original bolts that held the old rearsets then tap in some threads.

I  made up a wooden template for us to get the holes right

 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 13, 2017, 07:47:40
(https://uploads.tapatalk-cdn.com/20170813/7a3888c86277e6af12770635b9809182.jpg)

It's pretty ugly


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 13, 2017, 08:43:07
No bunble wrap, use the thin foam inderlay for floating floors. Its strong and thin works awesome. Cheap too.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 14, 2017, 06:58:23
Ok so today made some good progress managed to hit the frame again with the wire brush then paint it up.

First I had to de tab the frame
(https://uploads.tapatalk-cdn.com/20170814/34e75b6b39387fa4ef59ffe32c19c468.jpg)(https://uploads.tapatalk-cdn.com/20170814/e806d4962da59e8c5965ff316d33dee9.jpg)(https://uploads.tapatalk-cdn.com/20170814/e61758a77ed7ff0d50c488a8ca8284a3.jpg)(https://uploads.tapatalk-cdn.com/20170814/9377e1aaabb73be6806dce3e94f52bd0.jpg) tabs done

Then on to spraying. Let me go on the record as saying I'm not even a spray painters, butchers, second cousins, Guinea pigs vet.

(https://uploads.tapatalk-cdn.com/20170814/87b6872a51d1b18a052ae1f6641d26f6.jpg)(https://uploads.tapatalk-cdn.com/20170814/d2ad22c57eb39cc507dcbaf895c17ab9.jpg)(https://uploads.tapatalk-cdn.com/20170814/48eaa76cbf23d34ae1812aa0d02e37c0.jpg)(https://uploads.tapatalk-cdn.com/20170814/5cc8e2fdc15b6a5f5d129e0a396d5066.jpg)(https://uploads.tapatalk-cdn.com/20170814/73a2456f7f1942ff5f26a9a36598f3e5.jpg)(https://uploads.tapatalk-cdn.com/20170814/9c4e9f53d99de7ae2e06713ea75e577b.jpg)

Luckily the clothes line is weight rated 🤙

Next we went to the mill to modify the top triple

(https://uploads.tapatalk-cdn.com/20170814/16b08c3ed6fe6e7efede3cc1e2d48ce0.jpg)

Set up is everything (https://uploads.tapatalk-cdn.com/20170814/d8be614413ccef89886958a168743d33.jpg)

First we wanted to make the slot to house the idiot lights
(https://uploads.tapatalk-cdn.com/20170814/6ca7f765efbecc275abbb4b338607eb3.jpg)
(https://uploads.tapatalk-cdn.com/20170814/506bd73ca2d5ee325f10bf99f6bc7c5a.jpg)

Originally there was a Suzuki emblem countersunk into the triple and its dimensions were larger top to bottom than the idiot lights so we chamfered all around the gauge.

Next we decided to use the hole that use to mount the ignition, and bore it out large enough to house the speedometer.

We had to be careful not to take out any of the ribs on the underside of the triple
(https://uploads.tapatalk-cdn.com/20170814/ad6cf3cf26b1596c718db8679b1321a5.jpg)(https://uploads.tapatalk-cdn.com/20170814/7cd496513d525669bd7fe3573a2a7434.jpg) it was slow going so we tried our luck with a 54mm circular cutter (https://uploads.tapatalk-cdn.com/20170814/8d846e9b4a0a3e8346ae868b9a04d794.jpg)

It paid off

(https://uploads.tapatalk-cdn.com/20170814/0e9d592d74e8633d21aad8c5e66e714e.jpg)

Then it was back to boring until we got it to the required size

(https://uploads.tapatalk-cdn.com/20170814/b8dbd038a821e83c17471090630eb9b5.jpg)

Then the final test to see if it's the right size
(https://uploads.tapatalk-cdn.com/20170814/2aea56004f38bc7c26d8c887aa96be10.jpg)

Success!!  We then needed to drill holes and tap threads on the underside of the triple to secure the gauges
(https://uploads.tapatalk-cdn.com/20170814/260e06c4b27f9037acfadb5f6c55395e.jpg)

(https://uploads.tapatalk-cdn.com/20170814/2a77b462fdfca1276bebf1ec2c0706e7.jpg)(https://uploads.tapatalk-cdn.com/20170814/a2f36a0cecd9ae7ae9a84ccb33ac2099.jpg)

Pretty happy with today's progress, tomorrow I'll get some more paint and put another few coats on the frame and the discretely bring it in to the lounge room and put it under the heating ducts to try and bake it... then it's on to the engine




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: dakine_surf on Aug 14, 2017, 08:20:03
Wow looks sweet, I really dig it, awesome machining


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 14, 2017, 08:23:41
Can't take credit for the machine work that was the old man he's the one with all the cool toys


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 14, 2017, 08:28:46
Top triple came out great, fits really well with the speedo. That's a good looking unit btw. Nice work!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 14, 2017, 08:32:33
It's from Daytona I can't wait to see them both lit up.... although that's going to be a little way down the track yet


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Aug 14, 2017, 16:12:30
Yeah, nice work on the triple clamp!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 15, 2017, 04:52:05
Ok so I drilled and taped a thread in the rear of the Triple to hold the speedo
(https://uploads.tapatalk-cdn.com/20170815/fa7033323aefdda5aa8f98bca8e990b4.jpg)

(https://uploads.tapatalk-cdn.com/20170815/97b2aba52f770f31663404122e2bebd2.jpg)

I messed up the M5 tap attempt and had to re drill it and go up to a M6

(https://uploads.tapatalk-cdn.com/20170815/e9bc5b21a8a45fbf09ff2fed44750afc.jpg)

Thankfully I nailed it second time round, I then decided to see how hi temp caliper paint would come up I figured if I didn't like it I would just strip it and get it anodised

(https://uploads.tapatalk-cdn.com/20170815/d8ee6220eeb8d305f70b3d2ba3460af1.jpg)
(https://uploads.tapatalk-cdn.com/20170815/f6b5eed17019d7f41a906dcb5ad50661.jpg)
(https://uploads.tapatalk-cdn.com/20170815/eddf1f63430d25fbf8bfc54d7f90966b.jpg)

I'm pretty happy with the way it looks see how it lasts

I then touched up a few parts on the frame I wasn't happy with and managed to sneak it into the lounge room without too much protest from the minister for war and finance

(https://uploads.tapatalk-cdn.com/20170815/064bc6bcb3d401c74f6410d88005ee42.jpg)

Was hoping to achieve more but such is life. Tomorrow engine I'll have to work out how the hell im going to prop it to spray. I'm thinking this one may be a little too much for the clothesline

Open to suggestions I purchased some steel rod and was thinking maybe using wood either that or I'll attempt my first mig welding project





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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 16, 2017, 04:41:32
So when I went to the auto shop to get some heave duty degreaser I noticed a atv jack on sale for $70

(https://uploads.tapatalk-cdn.com/20170816/c46dad484451121bca8becf7ac8a6efe.jpg)

(https://uploads.tapatalk-cdn.com/20170816/6fadfcbac3a8cac835dc51dedfc51a9f.jpg)

Probably couldn't raise a family underneath it but it will do while the degreaser was soaking in I thought I'd try my hand at rebuilding the rear brake caliper

(https://uploads.tapatalk-cdn.com/20170816/eb0d9bec473eb5b9a180f6ee48040570.jpg)

So being a noob and a bit of a retard I remover the brake line DONT do this as I learned you'll need that connected to pump the caliper pistons out later .

(https://uploads.tapatalk-cdn.com/20170816/d7ff26a86a83a82aa977f22727a36775.jpg)

So you have to remove this retaining plate to allow you to slip out the two pins that hold in the brake pad

(https://uploads.tapatalk-cdn.com/20170816/7f32f074ae4641e9d550e9e9096c2257.jpg)

I then pushed both pads together so as not to jag on the pins as I pulled them
Out
(https://uploads.tapatalk-cdn.com/20170816/12a4c3acc368acf06305ae6d1e2b7cb3.jpg)
(https://uploads.tapatalk-cdn.com/20170816/aaceb283ff57b45f0dc61cec375465b6.jpg)(https://uploads.tapatalk-cdn.com/20170816/1e244cd3b65fc6e885ad5160102ad82c.jpg)

It was at this point the light bulb went on and I reconnected the brake lines and began to pump the pedal

(https://uploads.tapatalk-cdn.com/20170816/2bf3960e8b8f63265e6decfc405a7a61.jpg)

Unfortunately one of the pistons was slightly seized and being a dumbass I didn't put something in place to stop one coming out while the other one came along.
(https://uploads.tapatalk-cdn.com/20170816/5ff871e5dea77d305a1aefbbcf745293.jpg)

Take two

(https://uploads.tapatalk-cdn.com/20170816/904b16a04f2cb5e1680b4244e74f6cd2.jpg)(https://uploads.tapatalk-cdn.com/20170816/d4c3eab946a43894370bbe664ab249c3.jpg)

Finally out but upon closer inspection I wasn't happy with the state of them so I've ordered some more unfortunately this means this job won't be getting completed this break boo

I've soaked  the caliper in thinners to eat away the paint and hopefully tomorrow I'll strip it back and spray it up



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 17, 2017, 04:22:42
So I found a few runs on the triple so had to fix it up, or risk having it do my head in every time I ride it.

Then I turned my attention to the caliper that I had left soaking over night

(https://uploads.tapatalk-cdn.com/20170817/75c093c203561ed0941dee72cde8cbb4.jpg)(https://uploads.tapatalk-cdn.com/20170817/8682615a6aca19c28659681c4d55fc73.jpg)
(https://uploads.tapatalk-cdn.com/20170817/3126b2ce7a5be4a1f2df460d68ab7377.jpg)

After a whole lot of scrubbing with various brushes it ended up coming up not too bad
(https://uploads.tapatalk-cdn.com/20170817/0f96efbb4385b7bf864dc617adb3380b.jpg)(https://uploads.tapatalk-cdn.com/20170817/5ed264e64f6f305995bf67c9b5cf7128.jpg)(https://uploads.tapatalk-cdn.com/20170817/4df19067147285c55469bf59312ba1ba.jpg)(https://uploads.tapatalk-cdn.com/20170817/ff6173e7c568e0988adb3b0d24ad60c2.jpg)(https://uploads.tapatalk-cdn.com/20170817/6be2485f08ee63e07ff6ba7844a9ac84.jpg)

Once it was ready I reinserted the pistons, valve and some bolts to stop the paint getting in and undoing all my hard work
(https://uploads.tapatalk-cdn.com/20170817/016d546e192dbd747e2aaa18f563b5ff.jpg)(https://uploads.tapatalk-cdn.com/20170817/65febc0ac1e9f4335b89d0ae5c043408.jpg)

I then set up a bracket to hole the caliper so I could paint it (https://uploads.tapatalk-cdn.com/20170817/77980a85a255bc509a808c1ecd7811a7.jpg)

(https://uploads.tapatalk-cdn.com/20170817/3b24ea1ab68387165429b30228b6b2db.jpg)
(https://uploads.tapatalk-cdn.com/20170817/c3d656cdafae5e91a4430402ad1c7636.jpg)(https://uploads.tapatalk-cdn.com/20170817/32f701c0a5df5823fd89aa57885decc4.jpg)(https://uploads.tapatalk-cdn.com/20170817/b60d54d3a4c80af7a7c00faa06182779.jpg)

Tomorrow after the paint has hardened I'll try to grind back the paint off the Honda see how it goes


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 17, 2017, 05:15:45
Sitting in the lounge room admiring my crazy can spray job I realised I needed to replace the grease nipple on the swing arm

Unfortunately it was snapped off in the hole
(https://uploads.tapatalk-cdn.com/20170817/471559ffe0dc0e0f573934f5145017bd.jpg)

Got the easy out

(https://uploads.tapatalk-cdn.com/20170817/f3119ce6caa9642e750d865d49d6028f.jpg)

Then boom just like new (https://uploads.tapatalk-cdn.com/20170817/20c49c9e308227831ae23b535882e081.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 17, 2017, 05:24:43
Sitting in the lounge room admiring my crazy can spray job I realised I needed to replace the grease nipple on the swing arm

Unfortunately it was snapped off in the hole
(https://uploads.tapatalk-cdn.com/20170817/471559ffe0dc0e0f573934f5145017bd.jpg)

Got the easy out

(https://uploads.tapatalk-cdn.com/20170817/f3119ce6caa9642e750d865d49d6028f.jpg)

Then boom just like new (https://uploads.tapatalk-cdn.com/20170817/20c49c9e308227831ae23b535882e081.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 18, 2017, 05:23:36
Ok so I sprayed up the engine, it's good from a far but far from good

(https://uploads.tapatalk-cdn.com/20170818/bf5ea618a7fe68675a348b36c387dec6.jpg)(https://uploads.tapatalk-cdn.com/20170818/592ed63faef74902d23623cc8bd957d6.jpg)(https://uploads.tapatalk-cdn.com/20170818/cadc25da7504e151f952c5b6a442075d.jpg)(https://uploads.tapatalk-cdn.com/20170818/e2e31550a73aa325d73bde73113017d5.jpg)(https://uploads.tapatalk-cdn.com/20170818/5f1e9acb8a3a7bcbb5c8f91d19c53be1.jpg)

See how I go, I will have to let it dry for at least another day and maybe try to install it on Sunday

I've decided I'm not happy with the way the triple came up in paint so I going to send it away to get anodised, hopefully that will get done while I'm away at work.

Tomorrow I'll try to touch up the brake caliper so you can see the Honda logo, not sure how much more I'll achieve this break.

Still have to send the rear disc away to get cross drilled

Fabricate the rear set brackets and get on to the seat section lol the list goes on maybe I'll try my hand at the seat again


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 19, 2017, 20:06:15
Ok so I'll probably need to polish up the side covers more but I fly out to work tomorrow so wanted to put everything back together so bolts and stuff don't disappear

Yesterday I sprayed over the Honda logos with black paint then tried to polish it back to bring it up somewhat newer
(https://uploads.tapatalk-cdn.com/20170819/23e96673f6fadbc7d583f526e9773844.jpg)(https://uploads.tapatalk-cdn.com/20170819/f9e3d267f64b632398251f03f9c5e1f5.jpg)(https://uploads.tapatalk-cdn.com/20170819/ccf63f573facb55ea107221de7877c29.jpg)

This is how the brake caliper came up (https://uploads.tapatalk-cdn.com/20170819/044f28bf73958f5d317f079c972da038.jpg)

I was going to try and remake a seat but the paint on the frame has only cured for a few days and it's been cold so I'm worrried I'll scratch it ir I try to put it back together





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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 20, 2017, 06:30:09
Well this is it

(https://uploads.tapatalk-cdn.com/20170820/c22539c2a6deee6dcf2bf8a7b8c7545e.jpg)

Fly out to work tomorrow morning just enough time to clean up the shed and put everything in a safe place

I sprayed another coat onto the frame this way it will have 6 weeks to cure

I think once I reassemble the frame and engine I may try to make a different seat pan not sure if I'm 100% happy with the original shape few too many faults

Then I need to work out where to put the electrics

Oh well it's only online shopping from here until I return can anyone recommend somewhere to get different kinds of led or projector headlights that's one of the last couple of things I need to buy


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Aug 21, 2017, 09:15:05
Great work. Next, the fun part of turning all the shiny parts back into a motorcycle. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 21, 2017, 13:55:38
Yep there's the tricky bit, also doing all that without scratching anything.

The thing i think that will be most difficult thing will be the electrical


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: BigNickel on Aug 22, 2017, 07:45:23
Painting has turned out very nice. I'm looking forward to this coming back together!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: ChopperCharles on Aug 22, 2017, 11:57:45
Why are you mounting a steering damper on this bike? With the OEM head angle and the modern forks, you're going to have miles and miles of trail. You won't need the damper at all.

Charles.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 22, 2017, 16:25:17
The forks are infact shorter, im not sure by how much maybe an inch or so plus the front tyre is smaller in diameter by 2 in. I thought that would decrease the trail ??

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: ChopperCharles on Aug 22, 2017, 18:18:15
Yes, shortening the front suspension will decrease the trail, but you've decreased the stem-to-fork offset quite a bit. The old forks had a big offset from the steering stem to the fork tubes. The new forks you have, they're almost in the same plane. That increases trail by a very large amount. Lowering the bike in the front will decrease trail by a smaller amount. You *may* be able to compensate for the offset by lowering the front of the bike, and you might even get close to stock trail numbers (for the original frame) that way. But it's highly unlikely you'll be able to get anywhere near a trail number low enough to require a steering damper. You'll have to take measurements and do the calculations, but in all likelihood, the steering damper will prove to be unnecessary, and you'll save some weight by leaving it off.

Charles.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: ChopperCharles on Aug 22, 2017, 18:36:21
Here you can see how offset effects trail. Excuse the poorly edited drawings, but you get the gist.


Charles.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 23, 2017, 00:32:07
Yes, shortening the front suspension will decrease the trail, but you've decreased the stem-to-fork offset quite a bit. The old forks had a big offset from the steering stem to the fork tubes. The new forks you have, they're almost in the same plane. That increases trail by a very large amount. Lowering the bike in the front will decrease trail by a smaller amount. You *may* be able to compensate for the offset by lowering the front of the bike, and you might even get close to stock trail numbers (for the original frame) that way. But it's highly unlikely you'll be able to get anywhere near a trail number low enough to require a steering damper. You'll have to take measurements and do the calculations, but in all likelihood, the steering damper will prove to be unnecessary, and you'll save some weight by leaving it off.

Charles.
Wont be able to lower it anymore unfortunately she sits very low im actually worried it may be a little too low, wont know till i ride it.

I'll have to sit downnand work it out when im back home from work in 6 weeks.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 23, 2017, 05:16:20
Wont be able to lower it anymore unfortunately she sits very low im actually worried it may be a little too low, wont know till i ride it.

I'll have to sit downnand work it out when im back home from work in 6 weeks.

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Did you measure? 4-4.5 inches ground clearance is the lowest you can really go. And with that, don't hit any big bumps lol.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: ChopperCharles on Aug 23, 2017, 10:33:21
FYI, I went with 93-95 GSXR front triples for this reason. They have more offset than later trees, and they work with Hayabusa forks. (I used the 94 GSXR forks though, because that allowed me to run a mechanical speedometer and OEM gauges). A little more trail is not a big deal, it makes the bike stable. I'm just saying that the steering damper is likely completely unnecessary.

Charles.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 23, 2017, 16:25:06
Did you measure? 4-4.5 inches ground clearance is the lowest you can really go. And with that, don't hit any big bumps lol.
Its going to be very close to that amd agreed no bumps

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 23, 2017, 16:28:54
FYI, I went with 93-95 GSXR front triples for this reason. They have more offset than later trees, and they work with Hayabusa forks. (I used the 94 GSXR forks though, because that allowed me to run a mechanical speedometer and OEM gauges). A little more trail is not a big deal, it makes the bike stable. I'm just saying that the steering damper is likely completely unnecessary.

Charles.
Yea these are 2008 gsxr 750 forks, they are definitely shorter but im unsure the difference in offset.
Once i get home i will have to look im not too sure what the stock rake and trail is on the DOHC is. The powers been out all night on site and is still off so i was conserving my battery so the alarm would go off.
Hopefully there is power in the office then ill be able to do a bit of R&D, i think cognito moto had a thing on it saying that tue change wasnt to drastic with this conversion but we'll see.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 24, 2017, 08:32:36
Has anyone reading this done the Gsxr fork conversion on their cb 750 dohc and simply pressed a new stem in ? Im interested to see how it handles with a 17" rim on it

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 24, 2017, 09:21:07
Has anyone reading this done the Gsxr fork conversion on their cb 750 dohc and simply pressed a new stem in ? Im interested to see how it handles with a 17" rim on it

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Hold on, can you give me this info:

Wheel size front and rear
rear shock length
what swingarm
Length difference of front end
tire sizes being used

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 24, 2017, 16:43:00
110/70 front 150/ 60 rear both on 17" rim, swingarm original cb 750 f2 720mm fork length the original were 780mm with 19" rim but i cant remember tyre size

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 24, 2017, 17:05:39
110/70 front 150/ 60 rear both on 17" rim, swingarm original cb 750 f2 720mm fork length the original were 780mm with 19" rim but i cant remember tyre size

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Rear shock length?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 24, 2017, 19:15:18
Im going to have to ask the wife to measure it up sorry im overseas atm ... leave it with me im trying to work out how to explain clevis to clevis :/

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 24, 2017, 19:33:23
Im going to have to ask the wife to measure it up sorry im overseas atm ... leave it with me im trying to work out how to explain clevis to clevis :/

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Lol!!! Ur drop in the front is right at 3ish inches, bit i need the shcok lengtg to figure in any rear drop. If its the same, 3 inches is actually sizable and will have a big effect up front.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 04:42:04
(https://uploads.tapatalk-cdn.com/20170825/4ae917dad2db6ffb80b33fd2c214505a.jpg)

35cm is the call

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 06:48:11
Ok with the tires and everything you're .5 lower in the rear, and 4 lower up front. That's before factoring ib the rear shock, which I think is longer that stock. Stock I think was around 13. If that's true, basically the front end of the bike is 4 inches lower, and the rear is stock. That's a big difference homie. I'm not sure how rideable that will be.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Aug 25, 2017, 06:54:31
...Stock I think was around 13.

Stock length in the F is 14". Either way, you're right: that's a pretty extreme alteration
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 06:56:19
Stock length in the F is 14". Either way, you're right: that's a pretty extreme alteration

Ok. .5 rear drop, 4.0 front drop. So 3.5 front drop normalized. That still may not be rideable.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 08:06:35
So how could this be countered?  Getting triples to lower the forks ?

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 25, 2017, 08:38:48
When you say not rideable, do you mean because the forward lean decreases rake angle and thereby trail? To some extent that would be countered by the smaller offset, right?

What is the offset in the GSXR triples? I believe stock is 45mm?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 08:39:37
So how could this be countered?  Getting triples to lower the forks ?

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Assemble the bike and measure the rake. If it's poo poo that's one way yes. I've only seen that done for 1 inch though, you'd likely want to do at least 2 inches.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 08:41:09
When you say not rideable, do you mean because the forward lean decreases rake angle and thereby trail? To some extent that would be countered by the smaller offset, right?

What is the offset in the GSXR triples? I believe stock is 45mm?


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Yes and no. The rake is going to be shit most likely. No offset on the world is going to fix that. It will be extremely quick.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 25, 2017, 09:01:25
My knowledge about this is mostly theoretical, but from what I understand rake angle in itself doesn't affect handling that much? What affects handling is primarily the trail number (which is of course a product of rake angle). In the "Tony Foale test" (https://tonyfoale.com/Articles/RakeEx/RakeEx.htm) they experimented with even using even 0 degree rake angle and found it handled pretty normally as long as the trail was kept the same.

..just saying that if the decreased rake angle results in less trail (and thereby twitchy/dangerous handling), then a smaller offset in the triple would pull the trail in the opposite direction. Could be like jag767 says it's way too small difference to compensate for the result of the decreased angle though.

Measuring rake angle with the current setup sounds like it'd be a good idea to put numbers on the change? (good luck getting the wife to do that  ;) )

Does the forward lean have other implications than rake/trail? Would weight distribution change and affect handling?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 09:04:31
My knowledge about this is mostly theoretical, but from what I understand rake angle in itself doesn't affect handling that much? What affects handling is primarily the trail number (which is of course a product of rake angle). In the "Tony Foale test" (https://tonyfoale.com/Articles/RakeEx/RakeEx.htm) they experimented with even using even 0 degree rake angle and found it handled pretty normally as long as the trail was kept the same.

..just saying that if the decreased rake angle results in less trail (and thereby twitchy/dangerous handling), then a smaller offset in the triple would pull the trail in the opposite direction. Could be like jag767 says it's way too small difference to compensate for the result of the decreased angle though.

Measuring rake angle with the current setup sounds like it'd be a good idea to put numbers on the change? (good luck getting the wife to do that  ;) )

Does the forward lean have other implications than rake/trail? Would weight distribution change and affect handling?

He is using the 17 up front, the offset is fine for that wheel. He can add rake to the triple, but that will only make the bike lower, which is already an issue
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 25, 2017, 09:16:09
Not sure I understand what the triple tree offset has to do with wheel size?

Rake angle, offset, fork length and wheel size all affect trail of course, but given a 17" wheel, different offset would give different trail.

Not suggesting he goes chopper with raked triples :)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 09:58:26
Not sure I understand what the triple tree offset has to do with wheel size?

Rake angle, offset, fork length and wheel size all affect trail of course, but given a 17" wheel, different offset would give different trail.

Not suggesting he goes chopper with raked triples :)


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Maybe im wrng but isnt the offset of the triple match to thr wheel size?  Honestly, a few degrees of rakr on a triple with more offset and a drop could fix the issue, potentially. Id actually have to figure out the numbers. Getting someone to design and cnc it wil be expensive.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 16:00:10
Ok so Devin the legend from conito moto sent me this
(https://uploads.tapatalk-cdn.com/20170825/4330fa182f9436ead788749a6cfc4b36.jpg)

Those numbers arent too far from stock trail but i still need to work out rake, and like you said Lights out first my pregnant wife would have to install the motor rebuild the frame put the wheels on and then somehow understand how to work out the rake ....chances are slim

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 16:34:52
My knowledge about this is mostly theoretical, but from what I understand rake angle in itself doesn't affect handling that much? What affects handling is primarily the trail number (which is of course a product of rake angle). In the "Tony Foale test" (https://tonyfoale.com/Articles/RakeEx/RakeEx.htm) they experimented with even using even 0 degree rake angle and found it handled pretty normally as long as the trail was kept the same.

..just saying that if the decreased rake angle results in less trail (and thereby twitchy/dangerous handling), then a smaller offset in the triple would pull the trail in the opposite direction. Could be like jag767 says it's way too small difference to compensate for the result of the decreased angle though.

Measuring rake angle with the current setup sounds like it'd be a good idea to put numbers on the change? (good luck getting the wife to do that  ;) )

Does the forward lean have other implications than rake/trail? Would weight distribution change and affect handling?
Very interesting read

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 16:59:03
If i read that right (hard to read on my phone) youve gone from 27 to 23? Thats a low number. Lots of different stress on the frame it wasnt designed for. If a custom triple is on the table, im thinking do a 1 inch drop, increase the offset, and add 2 degrees of rake in the triple. At that point I'd  wager youd be ok. The rake in the triple is a chopper thing, but i see not reason just adding a tad would hurt. If someone knows better please correct me.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 21:19:27
Devin at cognito moto said that this particular set up would improve the handling although i was unable to provide him with tye rake so he was only going of the information i could provide

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 21:37:06
Devin at cognito moto said that this particular set up would improve the handling although i was unable to provide him with tye rake so he was only going of the information i could provide

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I just reread. And yea, you don't need more offset with a 17. The rake is an issue though. And the ground clearance would be a potential worry for me. Can you drop the rear an inch without the rear tire hitting the seat?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 21:44:54
I just reread. And yea, you don't need more offset with a 17. The rake is an issue though. And the ground clearance would be a potential worry for me. Can you drop the rear an inch without the rear tire hitting the seat?
(https://uploads.tapatalk-cdn.com/20170826/10ca6336a8086025704d965dd7e60d66.jpg)

I don't think the tyre will hit the seat



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 25, 2017, 22:17:12
I was asking if you could go with shorter shocks, which you definitely cant. Basically at this point in the game your only option is a custom triple.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 22:59:58
I was asking if you could go with shorter shocks, which you definitely cant. Basically at this point in the game your only option is a custom triple.
Definitely cant i think the rear is at its limit plus i dont want to lower it anymore for fear of clearance issues :/ hmmm

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Aug 25, 2017, 23:16:57
I don't remember what rear wheel size you have on but can you go to a smaller rear wheel?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 25, 2017, 23:56:45
I don't remember what rear wheel size you have on but can you go to a smaller rear wheel?
Its 17 " also

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Aug 25, 2017, 23:59:24
Aw, crap, so much for that idea.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Aug 26, 2017, 01:22:41
If you are worried about ground clearance and rake, Cognito moto make a nice stepped top triple clamp, a cheap way of raising the front end. I suggest you put the bike back together then worry about the problems as they arise. ie if the bike has ground clearance issues raise the front or rear, IF the front end is nervous then fit a steering damper. Unless you fit a progressive damper or linkage it will make slow speed (traffic) maneuvering heavy. Most road bike owners with steering dampers are just trying to show off, how aggressive do you ride on the road?. I say go with what you have, looking great by the way, and later work out the problems or issues YOU do not like. Often I find things I expect to be a problem are not and others I had no idea cause me much swearing!!! Good luck
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 26, 2017, 01:42:25
If you are worried about ground clearance and rake, Cognito moto make a nice stepped top triple clamp, a cheap way of raising the front end. I suggest you put the bike back together then worry about the problems as they arise. ie if the bike has ground clearance issues raise the front or rear, IF the front end is nervous then fit a steering damper. Unless you fit a progressive damper or linkage it will make slow speed (traffic) maneuvering heavy. Most road bike owners with steering dampers are just trying to show off, how aggressive do you ride on the road?. I say go with what you have, looking great by the way, and later work out the problems or issues YOU do not like. Often I find things I expect to be a problem are not and others I had no idea cause me much swearing!!! Good luck
Cheers for that i think that may be the best course of action. Trial and error until complete

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 26, 2017, 03:33:26
Agree with Popeye, try it out! I'd probably also measure rake, trail, ground clearance and swingarm droop just to put measured numbers on those things rather than calculated ones.

Did some calculations with the numbers available and didn't see a dramatic change in trail. Could of course be way off, but my bet is that when you get to ride it, it'll feel and handle well!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 26, 2017, 04:59:46
Trail isn't  the problem. His nemesis will be speed bumps, and being stable at 55mph  ;D

Don't feel bad, I screwed up a bike so bad I had to cnc a new oil pan, and fab a new exhaust just to have sufficient ground clearance to clear ant hills. It happens lol.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 26, 2017, 06:31:50
Trail isn't  the problem. His nemesis will be speed bumps, and being stable at 55mph  ;D

Don't feel bad, I screwed up a bike so bad I had to cnc a new oil pan, and fab a new exhaust just to have sufficient ground clearance to clear ant hills. It happens lol.
Yea thats why i need to come up with some way to effectively mount the steering damper... and then spend the rest of my days watching out for speed bumps

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 26, 2017, 06:44:25
Yea thats why i need to come up with some way to effectively mount the steering damper... and then spend the rest of my days watching out for speed bumps

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Even with a damper 23į is worrysome, that's less than modern sportbikes. Then there's the issue of the added stress to the frame with the new head tube angle.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 26, 2017, 07:16:31
Even with a damper 23į is worrysome, that's less than modern sportbikes. Then there's the issue of the added stress to the frame with the new head tube angle.
Devin seemed to give me the impression that there was no issue and that it would improve handling..

has anyone following this thread actually done this conversion? ? I know guys who are in the process of doing this but noone has finished and tested it.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 26, 2017, 08:25:55
Devin seemed to give me the impression that there was no issue and that it would improve handling..

has anyone following this thread actually done this conversion? ? I know guys who are in the process of doing this but noone has finished and tested it.

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At low speed, yes. But the faster you go the more twitchy itll be.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Aug 26, 2017, 19:45:46
I haven't messed with this particular swap but I have taken a modern front end and put it on an old motorcycle. Honestly the bike probably handled better before. Now it did well around town but if you really wanted to ride the bike the handling sucked. The bike didn't want to turn, would want to stand up in mid turn, etc. I wound up finding a front end that was a close match with the original equipment and the bike improved. To me, it's not worth going through all this trouble and end up with a bike that may handle worse than it did before.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Aug 26, 2017, 19:54:36
I haven't messed with this particular swap but I have taken a modern front end and put it on an old motorcycle. Honestly the bike probably handled better before. Now it did well around town but if you really wanted to ride the bike the handling sucked. The bike didn't want to turn, would want to stand up in mid turn, etc. I wound up finding a front end that was a close match with the original equipment and the bike improved. To me, it's not worth going through all this trouble and end up with a bike that may handle worse than it did before.

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With his numbers i'd wager it'd dive into a turn more than anything, but your point is still the same.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 27, 2017, 04:42:15
I guess the proof will be in the pudding, im too far in now to turn back. I've committed to the frobt end conversion and will now have to see it through to fruition. I wish i wasnt away for another 5 weeks i could probably have it just about finished if i had that long to work on it... although that estimation may blow out as i am thinking of redoing the seat pan

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Aug 27, 2017, 14:59:17
If you go with the stepped triple you should be fine. As well as a steering damper. There are lots of guys who use 17Ē rims front and back, just go to the cb1100f.net site and youíll see tonís of examples. One of the guys sells kits for the conversion to 17Ē cbr rims. I believe Freddie Spencer had 17Ē wheels on his bike. Granted he did use stock length forks. Iím not sure of the numbers on the stock forks but I donít think itíd be more than 2Ē difference. He definitely had a damper. Also, though I did change the rear suspension on my f, the bike handles very well with the damper. My trail was 4.4Ē right there with modern sports bikes.  If youíre worried about clearance you can switch to a 4-2-1 header and gives you a little more space. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Aug 27, 2017, 16:17:57
4.4" would be closer to a Honda shadow than any modern sport bike. They are around 3.8" and below.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Aug 28, 2017, 03:00:16
Youíre right, I went back and checked my numbers.  My trail is right about 4.  I was thinking of my nighthawk.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 30, 2017, 08:20:26
Ok so some more progress, before I left I had identified that the part of the CR carbs that inserts into the boots was the incorrect external diameter.
(https://uploads.tapatalk-cdn.com/20170830/c4369dd64e9e8c3eb81a533fff0157c5.png)
(https://uploads.tapatalk-cdn.com/20170830/1458a0c5eed1ff1090d3abe110c15197.png)

Perhaps they were set up for a SOHC I'm not sure as the seller said they were of a cb 750... Maybe he was just talking theories to sell it.
(https://uploads.tapatalk-cdn.com/20170830/cad72930f60d443aee00500567fd530c.png)

I realised that the part in question simply unscrewed

Anyway before I left for work I passed my original carbs and new CRs to my dad, I explained the predicament and asked if he could turn me up some adapters on the lathe to match the external diameter so I could use normal CV boots

(https://uploads.tapatalk-cdn.com/20170830/4212599c8f20209fc9bd83897f9af890.jpg)

This was his plan

(https://uploads.tapatalk-cdn.com/20170830/c3bc4d97fab863f07053b67689caaefd.jpg)

(https://uploads.tapatalk-cdn.com/20170830/b71c682bf3e2bc3000eee38e4898a27d.jpg)(https://uploads.tapatalk-cdn.com/20170830/73202b8471daec2eea878307b76cf0c7.jpg)

The smaller one is the original

(https://uploads.tapatalk-cdn.com/20170830/22f560e4327153367e8f5288876699c2.jpg)(https://uploads.tapatalk-cdn.com/20170830/4e4e5c007d3fb453790334e59eafa8d8.jpg)(https://uploads.tapatalk-cdn.com/20170830/0de849fd8e46384789dd9c7145de8c9b.jpg)

He then match ported them so the internal diameter would match the internal ID of the CR s and the ID of the CV boot there was about a 6 mm difference between the two (https://uploads.tapatalk-cdn.com/20170830/9e1b091d05433f9ad34d7a1d2c6a6dcd.jpg)(https://uploads.tapatalk-cdn.com/20170830/1dd462420862f61f5f76470535540bbe.jpg)

This is the first of the four the other three are yet to be made but I'm pretty happy with the way it turned out (no pun intended)

After this the adapter brackets for the rear sets will be made up


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Aug 31, 2017, 06:25:35
Looks sweet! Nice luxury to have your own personal machinist :)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Aug 31, 2017, 08:57:36
The old man gets us out of some serious binds im lucky he loves it as much as i love bikes

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 01, 2017, 07:23:33
(https://uploads.tapatalk-cdn.com/20170901/1437691e5476caaf763d54d769992273.jpg)(https://uploads.tapatalk-cdn.com/20170901/1437691e5476caaf763d54d769992273.jpg)

Well that's done old mans punching out some professional work. I'm going to have to learn the lathe and mill.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: dakine_surf on Sep 02, 2017, 07:09:30
Beautiful machining... your dad is a talented man... is he running CNC or Manual?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 02, 2017, 07:14:54
Beautiful machining... your dad is a talented man... is he running CNC or Manual?


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Manual lathe and mill

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: dakine_surf on Sep 02, 2017, 07:17:35
Manual lathe and mill

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Hell yeah!  Such a lost art manual milling and the lathe, Really appreciate you sharing!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 02, 2017, 07:35:22
Hes going to fabricate the adapter brackets for the R6 rearsets next. Hopefully when i get home i can piece most of it back together

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 03, 2017, 07:44:54
Has anyone on here run the CR 29's on a cb 750 ? im just wondering do i need to change the petcock at all to provide more fuel or is the stock petcock fine ??

I just purchased new CV boots as the rubber had perished on my old ones which were cracked. It's my day off tomorrow Im trying to work out what else is left to purchase.

I know I have to customise the front brake line to allow for the clip on risers, but I will wait until i can take the whole bike to the shop just to ensure the lines sit nicely.

I still need to find some small LED or projector lights to mount into the custom front fairing i want to make.

Still also need to work out what size sprockets front and back will be best
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Sep 03, 2017, 13:37:01
Stock petcock will be fine.  No need to change it. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 03, 2017, 21:22:33
Stock petcock will be fine.  No need to change it.
Sweet one less thing to do, just need to nut out the mounting point for the damper. I looked at mounting it of the steering stop at the front but the damper is too long. 

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 04, 2017, 07:05:46
Finally found some 2" 10w LED i bought 3 1 with 25 degree spread the other 2 with 45 degree spread, hopefully they work with the front fairing i want to make

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 09, 2017, 03:15:27
so this is where I'm heading with the front fairing

this particular one is actually the front mud guard of some old bike with the windscreen being the visor from an old helmet

so Ive already ordered the 3 LED spot lights then when I get home I'll have to work out if im goint to make it myself out of fiberglass or try and find a fender

ill probablly stand mine up a little more at the top rather than having it roll back so much but I really like this idea very unique
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 09, 2017, 21:24:46
Back brake caliper pistons arrived in the mail (https://uploads.tapatalk-cdn.com/20170910/a9fdc91a36d14b767a707eefa5408f58.jpg)

Now i have everything i need to finish rebuilding the brakes

Hopefully the LEDs will arrive soon, ill he pretty happy if its all there waiting for me when i get back home



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 10, 2017, 02:38:52
So this is the beginnings of the prototype    for the rearset adapter plate

(https://uploads.tapatalk-cdn.com/20170910/494df74e3e7ce996ca226fd3fd49b3a5.jpg)

See how it goes im thinking once its completed getting them anodised black

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 10, 2017, 18:56:47
So got a few more progress shots from the old man.

Before he could begin the prototype he had to make a fixture to secure the unusually shaped bracked(https://uploads.tapatalk-cdn.com/20170910/1625da193ab186e7bb4b8dd3c4b23859.jpg)

Then based on the wooden template i made for him he penned the shape into the aluminum
(https://uploads.tapatalk-cdn.com/20170910/15f9a119f095854a924ca1fbbf0228e2.jpg)

This is how he got the radius or the curve on the ends i think he may have just purchased this for the job

(https://uploads.tapatalk-cdn.com/20170910/05a93ec5fcfa410fa5917c917578a819.jpg)

(https://uploads.tapatalk-cdn.com/20170910/0042d4a997bafd2cd0b282cfd79ea42d.jpg)

Its still pretty rough he may need to see the frame so we can better run with the angles of the frame (https://uploads.tapatalk-cdn.com/20170910/55fe52cc8d9d80e8bf6fed4152e05013.jpg)

This is where the art of fabrication patience and perseverance comes into play

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 11, 2017, 06:44:34
So we've modified the design (https://uploads.tapatalk-cdn.com/20170911/6f3b931f98665eb0f4b9e7390dee54f0.jpg)(https://uploads.tapatalk-cdn.com/20170911/be1acdd350c729d6f126ad4a96b60d2e.jpg)

This new adaptation on the original template will slim the bracket down to look a little cooler

(https://uploads.tapatalk-cdn.com/20170911/3a7c93943ed7259673416acb74474386.jpg)

Steady steady

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Sep 11, 2017, 10:07:12
Definitely envious of you having your personal machinist, looking good! I've seen some cut down and re-drilled the original mounts but custom is of course nicer.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Sep 11, 2017, 17:55:29
Definitely envious of you having your personal machinist, looking good! I've seen some cut down and re-drilled the original mounts but custom is of course nicer.

Yeah, custom is nicer and it's also a shame to much up the originals when some guys need them for restoration.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 12, 2017, 04:06:52
Yea once ive finished the build ill be selling off all the original fairings forks wheels and whatever else came of so that someone who's doing a resto can use it

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 12, 2017, 21:47:11
So some goodies arrived in the mail, the wifey was good enough to send me a few shots
(https://uploads.tapatalk-cdn.com/20170913/49376a54f83f1c68a2be0d88ce17a181.jpg)
(https://uploads.tapatalk-cdn.com/20170913/e692615747bdbfe85804378b2f783e6d.jpg)

New CV boots will hopefully create an air tight seal around the new CRs they cant be any worse that the old ones that were all cracked and perished

(https://uploads.tapatalk-cdn.com/20170913/a74e1021870db3cb68546db736d4aaaf.jpg)(https://uploads.tapatalk-cdn.com/20170913/3b377d2df0f6f0d3894491fc0ac9f906.jpg)(https://uploads.tapatalk-cdn.com/20170913/a84beead99779cd17dca4f2e19e676bb.jpg)(https://uploads.tapatalk-cdn.com/20170913/5269c88118477b918f2237c7e12bd236.jpg)

These are the 3 LED lights hopefully they work well with the front fairing im trying to dream up

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 14, 2017, 04:27:26
So to say I'm pleased with the prototype would be a vast under statement ...it surpassed all my expectations (https://uploads.tapatalk-cdn.com/20170914/a5ccc49b670c7dec6fc2d3ae02c5fa6d.jpg)

I'm seriously stoked so the real deal is going into production now

(https://uploads.tapatalk-cdn.com/20170914/446659270a63dc7a8b22c97c86554713.jpg)

Mark up (https://uploads.tapatalk-cdn.com/20170914/d9b0663f302b6c53c1ffffea1eff8722.jpg)

(https://uploads.tapatalk-cdn.com/20170914/1d54c663374bff82f36b741c93f262dd.jpg)

The rough cut ...now the hard part I'm not too sure how much the old man will get done but based on the prototype it will be worth the wait


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 15, 2017, 07:48:14
So had some more progress on the final pieces

(https://uploads.tapatalk-cdn.com/20170915/1bb2658969346906597ddef41c307a68.jpg)

(https://uploads.tapatalk-cdn.com/20170915/cfc71cb0e736474398c86433eedfad1b.jpg)

(https://uploads.tapatalk-cdn.com/20170915/b3726a5fe82e579cd273eeb867795387.jpg)
(https://uploads.tapatalk-cdn.com/20170915/cba6784b71fd70e5094f7094a19fc38f.jpg)

(https://uploads.tapatalk-cdn.com/20170915/38ca4c3fa9fc47a58a08171f5b96ad57.jpg)

This is as far as the job has progressed, but I'm more than happy to wait.

Had anyone on here put the 900 cams in their 750 I'm just wondering how much it's going to change the performance coupled together with the CRs and the 4into 1


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Sep 16, 2017, 00:21:48
Iíve done it, it does help a little but honestly Iíve already outgrown my 750. If I could Iíd gusset my frame and throw in a 1100f motor. Funds prevent me from such an endeavor.  :(
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 16, 2017, 00:32:09
that's alright I was just hoping for a little more poke around the street, if i want to go real fast that's what the R1 is for  ;)
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 16, 2017, 00:32:56
but seriously your bike looks trick, i love the rear swing arm
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 16, 2017, 04:58:21
Ok so the majority of the hard work is done

Just need to tap the holes for the rear sets to bolt onto and also work out the spacer size to put to accomodate for the oem bolts

(https://uploads.tapatalk-cdn.com/20170916/bdb85c344b29143d10cdaba7819dae74.jpg)(https://uploads.tapatalk-cdn.com/20170916/f9f9d09c6f9efd5f81a08f74b8b5f3f1.jpg)

Looking very cool


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 18, 2017, 07:48:47
Well I'm stoked the holes have been tapped and the rear sets bolted on... now I'm in two minds as to whether or not to get them anodised they look pretty good as is I may have to do a dry run.

(https://uploads.tapatalk-cdn.com/20170918/87fa490ce3d095bef5c987e05c60e431.jpg)(https://uploads.tapatalk-cdn.com/20170918/87fa490ce3d095bef5c987e05c60e431.jpg)

Only another two weeks and I can put these bad boys on

My brother also came through with the goods with the decal for the side of the tank

(https://uploads.tapatalk-cdn.com/20170918/e2084ffa59c534162c30cf1fc606b3c3.png)

Slowly slowly she's all starting to come together

Have to do some panel work I think when I get home among other things


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Sep 18, 2017, 11:38:40
I'd see about centering the wing on that logo: it'd look more balanced. Otherwise it just kind of looks like a decal saying "Franken" was tacked on to original. My $0.02.

They're pretty slick otherwise though; I love that your brother was able to match the font so closely to original
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Sep 18, 2017, 14:53:57
Damn, those brackets look fantastic!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 18, 2017, 17:41:44
Damn, those brackets look fantastic!
Cheers I'm looking at what needs to be done to convert the mill to a CNC , hopefully we can design and replicate some of his work

When I get home I'll see how it looks maybe I'll just anodise it clear


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 18, 2017, 17:46:57
I'd see about centering the wing on that logo: it'd look more balanced. Otherwise it just kind of looks like a decal saying "Franken" was tacked on to original. My $0.02.

They're pretty slick otherwise though; I love that your brother was able to match the font so closely to original
Yea when it's in the middle it just doesn't sit right with me so it will have to look tacked on

Next challenge is getting the paint to match and also getting him to replicate the blue stripes , and work out how to / whether or not to strip the front and rear fairing


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Sep 19, 2017, 01:36:19
Yea when it's in the middle it just doesn't sit right with me so it will have to look tacked on

Next challenge is getting the paint to match and also getting him to replicate the blue stripes , and work out how to / whether or not to strip the front and rear fairing


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I wouldn't move it to the middle but rather about 1/3 of the way from the front.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 19, 2017, 03:18:03
I wouldn't move it to the middle but rather about 1/3 of the way from the front.
Spoke to my brother he will make up a sample I'll compare the two


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 21, 2017, 17:16:16
Can anyone tell me what the original front and rear sprocket ratios were on the dohc 750s I want to get new ones but I'm not at home to count the teeth also how many links in the chain ?? Cheers in advance


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Sep 22, 2017, 11:19:28
Can anyone tell me what the original front and rear sprocket ratios were on the dohc 750s I want to get new ones but I'm not at home to count the teeth also how many links in the chain ?? Cheers in advance


Yup!
Taken directly from the Honda Factory Service Manual, 1981 Addendum (there were no driveline changes in 1982):

CB750F and K ran 18 Front/46 Rear (2.555:1 ratio) with a 108 link, #530 chain.

CB750C was 18/43 (2.388:1) with 106 link, #530 chain (loses some acceleration, but better for cruising/touring).

 I went to a 17/40 combination with a 106-link chain on my 750C. Almost the same ratio (within 1.5%), but the smaller sprockets were on sale and saved me about/40. Also, it was cheaper to buy a 110 link chain and shorten it, than to buy a 106-link.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Sep 22, 2017, 16:15:38
Yup!
Taken directly from the Honda Factory Service Manual, 1981 Addendum (there were no driveline changes in 1982):

CB750F and K ran 18 Front/46 Rear (2.555:1 ratio) with a 108 link, #530 chain.

CB750C was 18/43 (2.388:1) with 106 link, #530 chain (loses some acceleration, but better for cruising/touring).

 I went to a 17/40 combination with a 106-link chain on my 750C. Almost the same ratio (within 1.5%), but the smaller sprockets were on sale and saved me about/40. Also, it was cheaper to buy a 110 link chain and shorten it, than to buy a 106-link.

Awesome I think my rear hub is a k anyway as it's a spoked rim with a disc brake, the original rim was a cornstar and it actually runs a different sprocket I was a bit devo as I was going to reuse it

If you change to a lighter chain say a 520 does that effect the sprockets you can use ?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Sep 22, 2017, 21:39:56
Yea it does. 520/530 are both 5/8" long between the links, I believe 520 is narrower (thinner). Might have concerns fitting on stock-sized sprockets (but I've never tried).
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Sep 25, 2017, 13:17:30
If you run a 520 chain you have to run 520 sprockets
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 04, 2017, 23:44:24
So got back from work and decided after a red eye I would try to work in the bike... apparently this was not such a good idea, thought I would tackle the caliper rebuild

(https://uploads.tapatalk-cdn.com/20171005/6426be01c585525bd9bfa33361b0f672.jpg)

So these were the original pistons pitted, scratched and rusted

(https://uploads.tapatalk-cdn.com/20171005/6e6ee633cdc43ae25b68d6cfb108b067.jpg)

Here are the new ones that arrived

First I installed the rubber seals in, There is a thicker one that is inserted into the lower groove

(https://uploads.tapatalk-cdn.com/20171005/e444cec0f99fa8cc0fe20ca4de8914c3.jpg)(https://uploads.tapatalk-cdn.com/20171005/62c7b557240fe25b3c32c238b9e27a3b.jpg)

Through great skill and mastery I somehow managed to twist the seal as I installed it, after a little cursing and persistence I untwisted it.

I then installed the smaller seal (https://uploads.tapatalk-cdn.com/20171005/b69e55b6f3c8dd4ca4701fb673c33e83.jpg)

Then repeated for the other side (https://uploads.tapatalk-cdn.com/20171005/049e78520060688ddb3c914514180cc3.jpg)

I then put a little grease on them

(https://uploads.tapatalk-cdn.com/20171005/9cbc9338a364d1401e095973367436e1.jpg)

Next I replaced the bleed nipple (https://uploads.tapatalk-cdn.com/20171005/74948aa612d52d75c794cfb2030b257d.jpg)(https://uploads.tapatalk-cdn.com/20171005/e19f10e7550d63cdd823add9eb728b86.jpg)

Then I installed the rubbers and hollow pin (https://uploads.tapatalk-cdn.com/20171005/805ff67b91d755cd306a4147c6d1e57a.jpg)

Then this is the moment where I totally fucked up

(https://uploads.tapatalk-cdn.com/20171005/92b0db7cccdb8c055479c17dae4bd305.jpg)(https://uploads.tapatalk-cdn.com/20171005/9154a13a5d0a94bb3dffca060c47f2ed.jpg)(https://uploads.tapatalk-cdn.com/20171005/bbb74a7c1b840cd719e8f1ebbc98fc61.jpg)

Yep put the pistons in the wrong way didn't I .... face palm moment... so being a kid raised on magyver I thought to my self what would he do... so I tried connecting the old rear brake master cylinder and for some reason I can't get the pistons to move out ... currently at an in pass.

So rather than give you turned my attention to getting the motor back in the frame, as I moved the stand the motor fell off and this happened

(https://uploads.tapatalk-cdn.com/20171005/f1e37fd17b692681c1d03e0e1c315641.jpg)

I'm hoping it still seals otherwise I'll be in need of someone to weld then machine it ... not really what I was hoping for

In addition I scratched the engine paint a little luckily it's on a side cover that can be removed and painted

I tried laying the engine over (https://uploads.tapatalk-cdn.com/20171005/4de104b4ff3e56abe061ec81f4a51504.jpg)

But by myself I'm one arm short of being able to put it back in I think I'll have to wait for some assistance ... unfortunately wifey is about 1 week from due so my number one apprentice is off

Another thing I noticed I need to replace these bolts that hold the engine cover on (https://uploads.tapatalk-cdn.com/20171005/a07b7cbb791a6531b204be298236c42b.jpg)

Does anyone have a part number or know the proper name for these ?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: hillsy on Oct 04, 2017, 23:55:19
You dont need to replace the entire bolt - you just want new rubber grommets for them. You should always replace these grommets if you are replacing the gasket as they tension the cover down to make it seal.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 05, 2017, 00:23:07
Thanks Hillsy, Do you have a part number for the gromit or know exaclty what its called so i know what to order online ?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: hillsy on Oct 05, 2017, 01:51:26
Number 9 in this schematic - they are called mounting rubbers - Honda part number is 90541-425-000


(https://images.cmsnl.com/img/partslists/honda-cb750f2-1982-c-germany-cylinder-head-cover_bigma000096e01_0eb4.gif)
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 05, 2017, 02:17:21
you are a god dam legend
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 05, 2017, 02:35:29
order placed cheers Hillsy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 05, 2017, 04:09:22
Ok so I couldn't let it beat me so I concocted a plan on how to get these pistons out

So first I connected the reservoir for gsxr front calipers

(https://uploads.tapatalk-cdn.com/20171005/78d6edaaad95f6786d5c5d3dd79098b5.jpg)

Then I proceeded to purge the line of air first I disconnected the line from the caliper it took a little but the fluid started coming through.

Once I had fluid there I kept the lever down and reconnected the line to the caliper

(https://uploads.tapatalk-cdn.com/20171005/b1e5b8d4d8367ef4f095660a42eb2ed5.jpg)(https://uploads.tapatalk-cdn.com/20171005/b1e5b8d4d8367ef4f095660a42eb2ed5.jpg)

Next I connected a clear line to the bleed valve and waited for the air to purge (https://uploads.tapatalk-cdn.com/20171005/0ea2b564c090565553186ed41cbba713.jpg)

Then I kept at it till there was movement on the pistons (https://uploads.tapatalk-cdn.com/20171005/ac0458c51f9510afced50f21f02252dc.jpg)

I just kept resistance on both the pistons so they came put evenly

(https://uploads.tapatalk-cdn.com/20171005/126c9ac95fa3449a1c101222099ceba6.jpg)

Success and now to undo my bad work and reinsert the pistons the correct way

(https://uploads.tapatalk-cdn.com/20171005/628d56a9ed4501e8eb1722a7e95d2e3f.jpg)

Ok so next I had to put the pads back in  each held in place with two pins (https://uploads.tapatalk-cdn.com/20171005/ddc493c052286c12dc2041c208c6207c.jpg)
(https://uploads.tapatalk-cdn.com/20171005/c48395eb9585224a167b706ae703d698.jpg)

Once the pins are in there is a retaining plate that bolts into place
(https://uploads.tapatalk-cdn.com/20171005/be1d6840befdda75a15a1296e186860c.jpg)

I then connected to the arm that secures it to the rear axle (https://uploads.tapatalk-cdn.com/20171005/66f5dddd37a308c5e9f8dfa8d5a2d5e7.jpg)(https://uploads.tapatalk-cdn.com/20171005/82a439875d28efd8f986a7705944b62b.jpg)

(https://uploads.tapatalk-cdn.com/20171005/661e51fc5001f4e1126775e48c778f3c.jpg)

Job done


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 07, 2017, 21:59:26
Ok so last night I managed to get down to the old mans with the frame so we could make up the final spacers required to fit the rearsets and also to make sure the brackets didnít interfere with any of the bolts ( which they did a little)
(https://uploads.tapatalk-cdn.com/20171008/ff0412d3381152c89743bfeb148fdc13.jpg)(https://uploads.tapatalk-cdn.com/20171008/3fb0ddfdec18aa7cd68f7b833e77fa8c.jpg)

So first we made sure the holes were in the right place.. the pressure was on as I was the one who made the template so if she was out it was on me, luckily she fit just like a bought one.

Once the brackets were finished n place we measured to see how big the spacers would need to be
(https://uploads.tapatalk-cdn.com/20171008/5cfedf7fda34924e346b79315bec8e40.jpg)

The right side required a larger spacer for the bracket as the left side sits just about flush

(https://uploads.tapatalk-cdn.com/20171008/aec8cac6dd6b3d577ae0e84628375c73.jpg)

We turned up the spacers for in between the rear set and the brackets first as they would be the same the two tops  and then the two bottom spacers

(https://uploads.tapatalk-cdn.com/20171008/a9adb4f1494be9afd21355e4f1160bbd.jpg)

Top spacer done

(https://uploads.tapatalk-cdn.com/20171008/03a386723db8b4049bc467732ca6187d.jpg)

Top and bottom complete

(https://uploads.tapatalk-cdn.com/20171008/131b9b23262a7e06232b4c59461cb3ba.jpg)(https://uploads.tapatalk-cdn.com/20171008/a0881a43e00a1a55aee700ca2310fac9.jpg)(https://uploads.tapatalk-cdn.com/20171008/f734d1059930cb3043a6ef9549d6d42e.jpg)

This was the spacer for in between the frame and the bracket

(https://uploads.tapatalk-cdn.com/20171008/f5cd7cb8d7692e0bdb1791bd7c3f89fb.jpg)
(https://uploads.tapatalk-cdn.com/20171008/ee7dcdcba524f218a3c9ee300a3c5f18.jpg)
(https://uploads.tapatalk-cdn.com/20171008/015ed3135537380b82bddd80155c24f3.jpg)

Right side complete next issue was that the swing arm bolt was too long so it needed to be shortened and rethreaded... this is always a tense moment as weíve found itís really hard to undo or put back what you mess up :/

(https://uploads.tapatalk-cdn.com/20171008/0b430ca34a1eca4527ed15f6b889062c.jpg)(https://uploads.tapatalk-cdn.com/20171008/72eaa1c489afe3867fbdc447d48ec71f.jpg)

Fist the old man established the thread size, this then dictates the gearing of the lathe.

(https://uploads.tapatalk-cdn.com/20171008/5a15c10b587dad7f3c43c5be21c0eab9.jpg)

Then he did the scratch pass and we double checked to make sure we were on point... came up all good

(https://uploads.tapatalk-cdn.com/20171008/c94706e84fc515f6006f44e48cf791f5.jpg)

Clearances were tight

(https://uploads.tapatalk-cdn.com/20171008/158666ae6b6c0e83984e38dda2a00b42.jpg)
(https://uploads.tapatalk-cdn.com/20171008/69f751c7ff121e0f9404d5142ca09a26.jpg)
(https://uploads.tapatalk-cdn.com/20171008/fcdd0562384e784da322414200179a3a.jpg)(https://uploads.tapatalk-cdn.com/20171008/e33c252ccb810b64569823e5739a0282.jpg)(https://uploads.tapatalk-cdn.com/20171008/56e9daf55b85e2e6f1cd4f3ec5bd8cd4.jpg)

So Iíve decided to leave it silver I think it would be a shame to anodise it black and not have the old mans craftsmanship stand out

...now Iíve got to work out how to get this engine in :/


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Oct 08, 2017, 00:17:06
Well done; those rearsets are looking boss!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Oct 08, 2017, 04:06:55
Looks slick man. Out of curiousity, why not continue the chamfer around the entire bracket? Noting seems to be mating that far out, and it may look a little cleaner. Just thinking out loud lol.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 08, 2017, 05:23:13
Looks slick man. Out of curiousity, why not continue the chamfer around the entire bracket? Noting seems to be mating that far out, and it may look a little cleaner. Just thinking out loud lol.
Because thatís the way the rear sets are chamfered, they are not chamfered around where the bolts are


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 08, 2017, 05:38:50
Ok so I decided to do the install of the engine by my lonesome...

First I propped the engine up on some blocks of wood I had laying around in the shed
(https://uploads.tapatalk-cdn.com/20171008/fe88406e7a0ad5125d4d120f935bbe7a.jpg)(https://uploads.tapatalk-cdn.com/20171008/4334cb8435819de8f69c5ef3b9a8800b.jpg)

Next I wrapped some rags around the frame in anticipation of me bumping and scratching it

(https://uploads.tapatalk-cdn.com/20171008/109458d0859a961259b06aba962554fb.jpg)(https://uploads.tapatalk-cdn.com/20171008/5d967848d044d0c55da92f67fe22477c.jpg)

The next bit I was unable to photo as I had my hands full, basically what I did was place the frame next to the engine then I sat my ass down on the floor and slowly shimmied it into position

(https://uploads.tapatalk-cdn.com/20171008/160f3ef4e1f98cca3729344baa2460a4.jpg)(https://uploads.tapatalk-cdn.com/20171008/047da9bf65ec2774aa7c57d85b17e7f2.jpg)

Then I went about tapping in all the engine mount bolts

(https://uploads.tapatalk-cdn.com/20171008/5ea5c5765977ea2ab1d401958eb92964.jpg)(https://uploads.tapatalk-cdn.com/20171008/bef952fd219ed785dbe8ba4d9c7c24e6.jpg)(https://uploads.tapatalk-cdn.com/20171008/21a057a07527aef08c2e54492feb6ccf.jpg)(https://uploads.tapatalk-cdn.com/20171008/c89026f65fa27325270ef65f92d4aa65.jpg)

This was the top engine mount at the back

(https://uploads.tapatalk-cdn.com/20171008/f7a01958b2babdad4f70145532069f40.jpg)(https://uploads.tapatalk-cdn.com/20171008/8846a99e37d8867124dbc2f7514b9447.jpg)

I then replaced the part of the frame that I had previously removed when taking out the engine

(https://uploads.tapatalk-cdn.com/20171008/5c4274087f62a8d64978298a31838b82.jpg)(https://uploads.tapatalk-cdn.com/20171008/e9c6b3c8c86558eff1e0071c6d61d49f.jpg)

Then onto the front engine mounts

(https://uploads.tapatalk-cdn.com/20171008/da0db1230aef84cbb5bbc14fa8a8b221.jpg)(https://uploads.tapatalk-cdn.com/20171008/fd90f43c8fc029ca8a0bc5376d3e07bf.jpg)
Rear sets and swing arm

(https://uploads.tapatalk-cdn.com/20171008/7e05a7d16600cac2d4a275bce3895b98.jpg)(https://uploads.tapatalk-cdn.com/20171008/379d6d63410ca9b96739e961915ee7d1.jpg)

Rear wheel, caliper and brake support

(https://uploads.tapatalk-cdn.com/20171008/57700cdb8b5b82418caabec8c148fd41.jpg)

I put in the centre stand to make it easier to get the forks in

(https://uploads.tapatalk-cdn.com/20171008/f24622b53d5747723b0c595d036fb715.jpg)

Then just for shits and giggles I put the tank and seat pan on

(https://uploads.tapatalk-cdn.com/20171008/4d93816db214702042b2864def69d3f1.jpg)

Iím not 100% on the seat pan, going to have to mull it over, also I still need a rear sprocket, the rear disc need to be drilled and all associated brake lines need to be made up... although brake lines will be some of the last things I do.

Tomorrow I will see how the carbs match up, then perhaps look at the front fairing and seat pan

At least she rolls now


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Oct 08, 2017, 08:22:42
Ahhh you mirrored it, very cool!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Cookie on Oct 08, 2017, 10:46:28
My Gord, thats pretty! Nice work, man.
I really dig that seat pan
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 08, 2017, 18:18:57
My Gord, thats pretty! Nice work, man.
I really dig that seat pan


The rear of it I like but the part I would sit on just doesnít gel with me for some reason

(https://uploads.tapatalk-cdn.com/20171008/2a78e88a8177c7da7f781924d4740959.png)

Someone flicked me this for inspiration it ties in beautifully with the tank, unfortunately my fibreglassing skills are at -100 amateurish on a good day


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Oct 09, 2017, 02:44:51
Looking really good!!! Youíre probably gonna have to relocate the kickstand. Hate to be the bearer of bad news but the bike looks dope!

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 09, 2017, 05:10:43
Ok so today I thought I would try my hand at making the seat pan again...

Brace yourselves

(https://uploads.tapatalk-cdn.com/20171009/bba21afcc35a73a2cab60c039db92473.jpg)(https://uploads.tapatalk-cdn.com/20171009/51600f0e2b8119385ad7897f532de9da.jpg)

So first for the glad wrap this is what I should have done the first time it pulls close to the contours of the frame and tank... instead of me putting mesh the first time, this was a fuck up as the fibreglassing didnít form to the frame properly

(https://uploads.tapatalk-cdn.com/20171009/8e86cdb141048400a847a22cf5dc6f58.jpg)

Next I tried to make a template out of thin cardboard

(https://uploads.tapatalk-cdn.com/20171009/10a2624029368c6bd5c1c218e17e34f4.jpg)(https://uploads.tapatalk-cdn.com/20171009/4913bc7a5861632360b9da5ec3810e4a.jpg)(https://uploads.tapatalk-cdn.com/20171009/ca62cc16d2d8c82eb59d99782efadda2.jpg)(https://uploads.tapatalk-cdn.com/20171009/e8b315e2e3295dc1933ae6cacc6b9abb.jpg)(https://uploads.tapatalk-cdn.com/20171009/4b978eb2b01e14c0f6ea805115aad3fb.jpg)

Unfortunately in hindsight I didnít glad wrap the frame enough Iíve already seen some spots where the resin made it onto the swing arm and subsequently wrecked the paint ... hopefully itís only on the swing arm, I can deal with that fingers crossed itís not on the frame.

(https://uploads.tapatalk-cdn.com/20171009/0c625e696708efc355790cdfd92f655f.jpg)(https://uploads.tapatalk-cdn.com/20171009/66c0d7ebf9c918f6b45a9ea710d5fa4b.jpg)

Then I laid the fibreglassing matting in place and painted the resin on

(https://uploads.tapatalk-cdn.com/20171009/3fd096754f320b314933f16d8941b776.jpg)(https://uploads.tapatalk-cdn.com/20171009/59654c638e81843708282fc1159824a1.jpg)(https://uploads.tapatalk-cdn.com/20171009/b67ec58a752a93adc3c65b04390cda88.jpg)(https://uploads.tapatalk-cdn.com/20171009/4ba64d2560a8751e8dfb07ccd2a9d307.jpg)(https://uploads.tapatalk-cdn.com/20171009/231852598f6b5b7ebfba8a77880d3894.jpg)

Now to let it dry then inspect how close or far I am from where I want to be, hopefully it comes up a little better than my first attempt


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 09, 2017, 05:13:48
Looking really good!!! Youíre probably gonna have to relocate the kickstand. Hate to be the bearer of bad news but the bike looks dope!

What makes you say Iíll have to relocate the kick stand ? The new rear sets ? :/ hmmm more modifications


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Oct 09, 2017, 08:08:18
Looks really good assembled! I liked the seat you had, but fingers crossed the second one turns out the way you want. As for kickstand I guess rearsets could interfere? or height could be wrong with the changed angles?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 09, 2017, 08:20:06
Yea she looked good from afar but was far from good

(https://uploads.tapatalk-cdn.com/20171009/e0f1046872aaf43926249d3938170915.jpg)(https://uploads.tapatalk-cdn.com/20171009/c6a32e019f591d8a04c9842b031d6a8a.jpg)

Because of the mesh I had to use big so it would sit properly

(https://uploads.tapatalk-cdn.com/20171009/f4f434694f5a7e943f54fd735f879d1a.jpg)
(https://uploads.tapatalk-cdn.com/20171009/3ab421cc324e9ee9e9a5b6cf5b5acc2c.jpg)(https://uploads.tapatalk-cdn.com/20171009/f1af86e8b6830b3f803dde2214f1b518.jpg)(https://uploads.tapatalk-cdn.com/20171009/2b98484835fcb93f07a320489a07bfb3.jpg)(https://uploads.tapatalk-cdn.com/20171009/443c35112ee69c3d107cc9d49ff59e4d.jpg)(https://uploads.tapatalk-cdn.com/20171009/de04ad6883e58fa74a341c5083d8ae91.jpg)

New one is a slightly more refined version of the first not too different as I really liked the shape of the original just not the finish


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Oct 09, 2017, 13:50:12
Yea, I think they may be in the way. I had to move mine.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 09, 2017, 18:35:36
Yea, I think they may be in the way. I had to move mine.

Have you got any photos of how and where you moved your kick stand, Iíd be interested to see how those before me dealt with this issue... to be honest it hadnít even crossed my mind until you guys brought it up.

I had noticed the angle of the kick stand changed because the bike is now lower but i didnít even contemplate the fact it might not return to the correct place... :/

Iíll try to sort this seat pan before tackling that issue, one thing at a time otherwise Iíll become overwhelmed.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 09, 2017, 22:40:26
Ok so the resin dried

(https://uploads.tapatalk-cdn.com/20171010/5552463964b72fd3bff506554430a0a2.jpg)
(https://uploads.tapatalk-cdn.com/20171010/11ee4120107d9c98a921966f343ac15b.jpg)

So I grabbed a marker and drew the lines I wanted to cut

(https://uploads.tapatalk-cdn.com/20171010/1c647d86f6d460dac8fc4fced673f021.jpg)(https://uploads.tapatalk-cdn.com/20171010/7367ae912f4e143471205014545ee9ea.jpg)

I removed the seat pan and original mould ..(https://uploads.tapatalk-cdn.com/20171010/4badc9281f929d63110dd806c09f3e7a.jpg)(https://uploads.tapatalk-cdn.com/20171010/999e46ea1918d20d8494eff339b5560b.jpg)

Unfortunately my glad wrapping wasnít as effective as I would have liked it to be...rookie error to be fixed once fibreglassing is complete...

(https://uploads.tapatalk-cdn.com/20171010/6d66c192346aa63f7487c274979cdf02.jpg) here is the new and old side by side for comparison, no one would have known the difference in quality except me, unfortunately that would have done my head in.

(https://uploads.tapatalk-cdn.com/20171010/d9aeb1497f9a15d2eae13428c249b9cd.jpg)(https://uploads.tapatalk-cdn.com/20171010/6742aa7fc218e26341758f52f9e3b69f.jpg)(https://uploads.tapatalk-cdn.com/20171010/63d0a4dbabf4c163037c0dfadd365baf.jpg)(https://uploads.tapatalk-cdn.com/20171010/ecd39a44a4404a167288ed8c1ebe934e.jpg)(https://uploads.tapatalk-cdn.com/20171010/9e88c704a36aea3e11d43e0e8e90a024.jpg)(https://uploads.tapatalk-cdn.com/20171010/dc243959e08d7bb619ca22679b515911.jpg)

Thatís how she sits now... there are a few spots that need to be built up and smoothed out.... so now Iíll wrap the frame up again and hit it round two, this time the plan is to get it as close to plum before just finishing it with bog as opposed to the bulk amount I used on the original




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: esmoojee on Oct 10, 2017, 01:26:00
Here you go. I got a tc bros and had it welded further forward close to the front engine mount.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 10, 2017, 01:29:15
i love this bike, its badass
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 10, 2017, 01:36:39
i can almost see your damper set up, there are a few guys with CB750s on the forum Im on here and we are all scratching our heads on how exactly to mount that.

I looked at mounting it on the steering stop but when i turn the froks it looks like they will contact the damper.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 10, 2017, 18:17:54
So the finish on the seat pan was really rough and textured.

So what I did was just mix the resin and pour it on without Abby additional fibreglass matting

Iíll wait to see how it turns out, currently in hospital waiting room baby day today ... watch this space




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Oct 11, 2017, 12:34:42
If you want it smooth you have to finish it the way you want and make a mold from the plug, then make your final product from your mold.  Or add a bunch of material to it and finish it . It will probably be heavy though if you go that route.

And good luck at the hospital !!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: advCo on Oct 11, 2017, 12:45:44
First issue is with that chop mat. That stuff isn't meant for smooth finished applications. What you should use is 6oz biaxial cloth common for boatbuilding applications. I used 5-6 layers on the seat on my 360.

You have the right idea of using resin to smooth, however straight epoxy is not ideal to shape to a final form. West System makes a featherlight additive for their epoxy which is a powder you mix in that essentially turns it into a epoxy based version of bondo. This is the stuff you want to use to build up on the exterior, then sand down to get your final, smooth form.

6oz mat
(http://images.tapatalk-cdn.com/15/06/08/9298493359e661b579fb40c710f15ee8.jpg)

Seat after initial glass layup, finished off with a coat of epoxy w/featherlight additive.
(http://images.tapatalk-cdn.com/15/06/08/c3e55141e8823dc3fa4d5da548385171.jpg)

After a few coats of featherlight and lots of sanding
(http://images.tapatalk-cdn.com/15/07/13/9eb83d966c99f9cb295c7f605e9e9506.jpg)

I should note that with 5-6 layers of mat and quite a bit of epoxy filler, this seat pan only weighs about 3-4 lbs.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 14, 2017, 05:44:14
 Ok so still at the hospital but had to do a run home so stuck my head in to check out my handy work(https://uploads.tapatalk-cdn.com/20171014/72df6b4ee169e16b32e6cad973121425.jpg)(https://uploads.tapatalk-cdn.com/20171014/06b4a77eb9dde3978b900ed626bfe786.jpg)

The seat pan came up really nice, the resin seemed to self level


(https://uploads.tapatalk-cdn.com/20171014/3d3292d28ae843e0b922fffa4f1a8251.jpg)(https://uploads.tapatalk-cdn.com/20171014/c2491574997dcceddc81b7169854e150.jpg)(https://uploads.tapatalk-cdn.com/20171014/3ada47a8e7823685e5f4b9a2b188599e.jpg)

But I think your right Iím going to need the fibreglass cloth over the rear section so it finishes nicely.

(https://uploads.tapatalk-cdn.com/20171014/efcb15d1a25d810805ab066015572db2.jpg)

Iím just not sure if this transition to the tank works nicely or I need to tie it on some how, to tie it on will be very challenging I believe

I need a pros eye to nail it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Ant36 on Oct 14, 2017, 22:50:29
There is also stuff called quick fair that is used in marine applications for finishing. It's Like the west systems stuff but easier to use.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 15, 2017, 04:41:41
There is also stuff called quick fair that is used in marine applications for finishing. It's Like the west systems stuff but easier to use.


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Nice because the smoother I can get it now the easier it is to finish later


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 18, 2017, 00:03:33
Ok back from our extended stay in hospital, mum and Jnr both home safe and sound..

So while they sleep I thought Iíd creep back into the garage to have another go at this seat pan

(https://uploads.tapatalk-cdn.com/20171018/874e2a9737273f61798903de58418289.jpg)(https://uploads.tapatalk-cdn.com/20171018/979b003d32208b87043d3c87e62e957c.jpg)(https://uploads.tapatalk-cdn.com/20171018/979b003d32208b87043d3c87e62e957c.jpg)

There were a heap of daggy bits hanging off it so I cleaned them up with the angle grinder

(https://uploads.tapatalk-cdn.com/20171018/ea70cc4ea59effa57972c000e88c8f8e.jpg)

To ensure the fibreglassing wrapped around the contour of the frame this time I sprayed  little contact adhesive to the seat pan first




(https://uploads.tapatalk-cdn.com/20171018/6d4b806be30b3ad0360f83ca6b5c815b.jpg)
(https://uploads.tapatalk-cdn.com/20171018/bf7c3c5949354990a824cc45155c4d06.jpg)(https://uploads.tapatalk-cdn.com/20171018/218e5684fe378a5fe46e5fa9eca70dac.jpg)

Once that was on I laid my fibreglass cloth

(https://uploads.tapatalk-cdn.com/20171018/89fad4c2807d97b19d732fd4e8d270ed.jpg)
(https://uploads.tapatalk-cdn.com/20171018/143e70ca234b7af99c25db7d09c44e92.jpg)
(https://uploads.tapatalk-cdn.com/20171018/e815d8fd867dae6c83ee088db11a9538.jpg)

Next I gave it a good coat of resin

(https://uploads.tapatalk-cdn.com/20171018/b9a43b82bcb02fa28024963ccb563283.jpg)(https://uploads.tapatalk-cdn.com/20171018/687072ff34733196d60af1b64b4a18f9.jpg)
(https://uploads.tapatalk-cdn.com/20171018/a01d628a2a02919fadc2d03dec9730a7.jpg)

This is how she stands while Iím waiting for the resin to cure,

Iíll give it a bit then see if it needs another coating, the seat itself is fine. Itís just the tail section I can see requiring a little more love... I wish I had of though of this before ... the old trial and error is quiet costly when your dealing with resin I think between this and my first attempt itís cost around $400 but I was set on doing it myself... thatís what experience costs you

Iíll still have to cut out a nook for the tail light led strip but that will be last



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 19, 2017, 03:21:32
Fibreglassing the saga continues

(https://uploads.tapatalk-cdn.com/20171019/85ae9a7cbb8d35a821c3e71b47849c8b.jpg)
So it was time to man up and start sanding this bad boy back

(https://uploads.tapatalk-cdn.com/20171019/2f57f48043e9c0335e97176cf4ff9a09.jpg)

(https://uploads.tapatalk-cdn.com/20171019/cdd94ae6d7a2937cc0633bfeb72daa79.jpg)(https://uploads.tapatalk-cdn.com/20171019/e19526d224e5e1bacbf7fc7947720aa6.jpg)

Progress was slow

(https://uploads.tapatalk-cdn.com/20171019/af01b174c33a71388fff362f29426064.jpg)(https://uploads.tapatalk-cdn.com/20171019/396351da7dfc821d889f62f411a487a5.jpg)

I think my use of contact adhesive was a poor decision Iíve found spots that did not bond and I believe that is the reason why. Iíll chalk that one down to experience (https://uploads.tapatalk-cdn.com/20171019/a16a69e270fc5de6b6dfc714861d411e.jpg)(https://uploads.tapatalk-cdn.com/20171019/62cf243cd79353fc6a2a1cc49b4479db.jpg)(https://uploads.tapatalk-cdn.com/20171019/3bbe59efdf8f51ed39a08cd24a8a667a.jpg)

You can see it laminated, it could be a culmination of my poor fibreglassing compounded by the fact I used contact adhesive.

(https://uploads.tapatalk-cdn.com/20171019/822b1f96f0a56a0eef06b2b53921878b.jpg)(https://uploads.tapatalk-cdn.com/20171019/e5a9be0f2db4233aa7a166d8e07e67af.jpg)(https://uploads.tapatalk-cdn.com/20171019/7299a28db9c8f73bb704e7b0ff710383.jpg)

I sanded it back and got it as close to spot on as I could. Some of the edges werenít sharp so I decided to do another layer of fibreglassing
(https://uploads.tapatalk-cdn.com/20171019/f78dd88475117d55ae9779b99de0e026.jpg)(https://uploads.tapatalk-cdn.com/20171019/786ca3b3007076b4b0e8761934c82020.jpg)(https://uploads.tapatalk-cdn.com/20171019/c6af1eebe3e632e2740280d8ff185ccb.jpg)(https://uploads.tapatalk-cdn.com/20171019/51d0989e92138ccfbb24afc3cc6b3df1.jpg)(https://uploads.tapatalk-cdn.com/20171019/a05df76375bb7692413adab10cacb903.jpg)(https://uploads.tapatalk-cdn.com/20171019/a3a4f4128d9a2053d4520715a0d83237.jpg)

As I was working in the garage the postman came past

(https://uploads.tapatalk-cdn.com/20171019/7e4651e74ba7e872ef20a4fea4a52008.jpg)

Said Japan had me thinking Honda,

(https://uploads.tapatalk-cdn.com/20171019/46041531eb44dec96c4b12dabf404d6e.jpg)

It was the rubber seals for the engine cover bolts.

Probably be another hour or so before the resin cures the weather has taken a turn and itís become a little cold which will extend the curing time

I tip my hat to guys that make custom fairings... itís definitely an art, and I ainít no artist


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 22, 2017, 01:03:08
So Iím toying with the idea of putting a ridge on the seat pan to tie in with the ridge on the tank

(https://uploads.tapatalk-cdn.com/20171022/9b2f895df084a0f694697a9ed17ec723.jpg)
(https://uploads.tapatalk-cdn.com/20171022/9959ff45d9886f0dd1b99cfd77ff58cd.jpg)(https://uploads.tapatalk-cdn.com/20171022/2e7d825762969e82c859962051b1a4a8.jpg)(https://uploads.tapatalk-cdn.com/20171022/3acedd1111d3f25b4fe5871fe97c160c.jpg)(https://uploads.tapatalk-cdn.com/20171022/13a45eec3717f8ecc5d03183bd8cc1fc.jpg)

Iíve used cardboard as a template I was going to cut slots into it so the fibreglass resin goes through it and bonds to the surface below

A little unsure


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: innovativems on Oct 22, 2017, 01:30:12
if you can make it flow, might work out good with the tank.  But do not glass the cardboard.  Just build it up with glass.  Cardboard doesn't do wellbwith fiberglass resin


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 22, 2017, 06:09:16
if you can make it flow, might work out good with the tank.  But do not glass the cardboard.  Just build it up with glass.  Cardboard doesn't do wellbwith fiberglass resin


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why is that does the card board collapse with the resin ? Iím just not sure how I can get sharp lines

(https://uploads.tapatalk-cdn.com/20171022/5ccb50670849f8b6a3de802fc2f931ee.jpg)

I peeled the layers of a little at a time to get the rib fading out towards the back of the tail
(https://uploads.tapatalk-cdn.com/20171022/858628ff1e49cd81a4abd5f825e74435.jpg)

I cut some grooves in the cardboard so the resin will go through it

(https://uploads.tapatalk-cdn.com/20171022/3ee634b05eb18ab8e2b88bd58b2d08d2.jpg)
(https://uploads.tapatalk-cdn.com/20171022/bbd0d13af3f4e862a8f460b413020a5e.jpg)

I think Iím going to have to put a thin layer of bog over it to smooth it out

(https://uploads.tapatalk-cdn.com/20171022/fdb6b1cfd73bae8a2d8b2c82f75d4f81.jpg)(https://uploads.tapatalk-cdn.com/20171022/c29cba4efb00c74137e959998c15e301.jpg)(https://uploads.tapatalk-cdn.com/20171022/e735c1e914f027af6bbf77c05549cbd0.jpg)(https://uploads.tapatalk-cdn.com/20171022/b08ae4676328326c05ad4df17013c5b2.jpg)

I used a marker just to show me the lines. There not exactly where I want them yet, a little uneven I think on the left top

Oh well back to the shed I go


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: innovativems on Oct 22, 2017, 17:47:00
Fiberglass resin cures through a chemical reaction with the catalyst and creates heat during that process.  Cardboard may work but also stands the chance to collapse/be inconsistent with how the resin saturates it.  And if you plan to paint it at some point; any issues could rear their head down the road if there is an air pocket somewhere.  To build that up, you could use a long straind fiberglass filler and tape off where you want the hardines.  Honestly I think it looks good without the center being raised. 


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 22, 2017, 18:59:09
   Well I took a punt on the cardboard

(https://uploads.tapatalk-cdn.com/20171022/56c376463178e39d7e925b7234f803c6.jpg)

I cut slot and drilled holes through it that I later injected the resin through

(https://uploads.tapatalk-cdn.com/20171022/aa85efd8cc3216c4b391823371983046.jpg)(https://uploads.tapatalk-cdn.com/20171022/8420e4ea66d8e50c6b455c52e7a980c1.jpg)(https://uploads.tapatalk-cdn.com/20171022/eadb2a37a1511194e6c339b9f0ee63e5.jpg)

There was a small void underneath the cardboard that I filled with fibreglass cloth

(https://uploads.tapatalk-cdn.com/20171022/a9b1aaa50135706300696bba0c5eac86.jpg)(https://uploads.tapatalk-cdn.com/20171022/e036781b0076007a6e1235d69c1f5c4d.jpg)(https://uploads.tapatalk-cdn.com/20171022/7f8d00ac3d46e84051c18404afe996eb.jpg)(https://uploads.tapatalk-cdn.com/20171022/ab3309b83bfebde14169c030dc107445.jpg)(https://uploads.tapatalk-cdn.com/20171022/2d32c09955b51cbef688983c8cbca136.jpg)(https://uploads.tapatalk-cdn.com/20171022/1876cb08d9974d137979ef83c9ed1383.jpg)

This is what I came into this morning

I had laid fibreglass cloth over the top of the cardboard also, I had excess resin also so I painted over the fairing to smooth it out the poured the rest where the seat will eventually end up and it smoothed it out a treat

Iíll go walk the dogs then when I return Iíll give it another layer of fibreglass and resin and square up the front of the ridge with the angle the back out the seat pan has.... then Iíll hit it with the sander again see what magic I can conjure up


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 23, 2017, 01:13:10
Ok so while I wait for the next lot of resin to dry I thought I would update

(https://uploads.tapatalk-cdn.com/20171023/03833d959d7eb2a0d2c3e83ef7fa9e9e.jpg)

So I sanded it back a little to see how poorly my makeshift mould held up

(https://uploads.tapatalk-cdn.com/20171023/f217e6aa866f3d890306c5aab1cd31de.jpg)(https://uploads.tapatalk-cdn.com/20171023/23ed1c6482c341aa6d60571096b0c38d.jpg)(https://uploads.tapatalk-cdn.com/20171023/bf593a75a948b3ee8f40e3f890a35129.jpg)

I then bogged it to fill in any holes

(https://uploads.tapatalk-cdn.com/20171023/335f8664fbde97cbc550c85a7301bad0.jpg)(https://uploads.tapatalk-cdn.com/20171023/5c48aee240e2ba0d53b76bed6a536b63.jpg)(https://uploads.tapatalk-cdn.com/20171023/7c97b785abadb773ee8aac4e2cc9ace9.jpg)

Once it was sanded back again I decided to put another layer of fibreglass cloth over it (https://uploads.tapatalk-cdn.com/20171023/267bdad19ee9e5880ddc891b8b1d9012.jpg)(https://uploads.tapatalk-cdn.com/20171023/1ed8dd49f5dc12a843e8eb919ffb5a18.jpg)(https://uploads.tapatalk-cdn.com/20171023/95226f1aba270e3f90be04e9b35910c7.jpg)

Now wait again for it to dry, I think due to my lack of skill this is a two steps forward 1 step back kind of process, hopefully itís worth the rigmarole.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Oct 23, 2017, 08:10:52
The ridge looks really promising. Will give the tail a pretty unique look and tie in well with the tank, which is a real focal point with the Fs.

And oh yeah, congrats on the addition to the family!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 23, 2017, 22:52:08
The ridge looks really promising. Will give the tail a pretty unique look and tie in well with the tank, which is a real focal point with the Fs.

And oh yeah, congrats on the addition to the family!


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Cheers weeman is doing alright.. yea Iím hoping the ridge ties in well.

(https://uploads.tapatalk-cdn.com/20171024/0b51d60d10ee08fe5a6a48e2bdc7c7f8.jpg)(https://uploads.tapatalk-cdn.com/20171024/3974115ecfa66a6444659af3566d556f.jpg)(https://uploads.tapatalk-cdn.com/20171024/3fb50da2fa7d37c7aead4b9071d67a0c.jpg)

I gave it a bit more of a touch up, I also went out and bought a round, flat and triangle file so I can get the edges of the ridge sharp


(https://uploads.tapatalk-cdn.com/20171024/40a2f3ab54ee1fdbd2d1504627b0b54e.jpg)

Just to get an idea of how my lines were I went over the edge with a marker again
(https://uploads.tapatalk-cdn.com/20171024/74b764cb446fca8168313704cf07973b.jpg)(https://uploads.tapatalk-cdn.com/20171024/d9d4858f3eff034b0401e8a57e60514b.jpg)(https://uploads.tapatalk-cdn.com/20171024/1d8f3948467cc06a9eb866a603f791c2.jpg)

So if you can imagine the preexisting decal of the blue lines from the tank following down either side of the ridge on the tail section this is where Iím heading
(https://uploads.tapatalk-cdn.com/20171024/42c92b26d815ac31fb11e8b09e20be14.jpg)(https://uploads.tapatalk-cdn.com/20171024/0641eae39d7b80dc3da8052fcde30e0d.jpg)

Just have to build it up a little to smooth of some more imperfections


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 24, 2017, 21:54:38
(https://uploads.tapatalk-cdn.com/20171025/b4184afa21b536a48179757475ad436b.jpg)(https://uploads.tapatalk-cdn.com/20171025/5fdefaca866b56ff716efeb91ad237b5.jpg)(https://uploads.tapatalk-cdn.com/20171025/3d8822d33f5cbc57a56438d58316ab8c.jpg)

I had allowed the garage to slip into a state of disarray, it was ruining my chi

(https://uploads.tapatalk-cdn.com/20171025/64f65665e5d9645a0a8813eeec15b03c.jpg)(https://uploads.tapatalk-cdn.com/20171025/cea771de822cd4bf9d49f28bad3001cf.jpg)(https://uploads.tapatalk-cdn.com/20171025/82179902923150132ff1d453d068d73d.jpg)

It probably doesnít really look like it but itís a bit cleaner now.

Iíve removed the seat pan and will touch it up on the bench before putting it back on the bike


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 25, 2017, 01:09:00
(https://uploads.tapatalk-cdn.com/20171025/10b1a2e658e811598fbc3d6b4ed498fc.jpg)
So while I was waiting for some fibreglassing to dry, I went off to the paint shop and got the tank colour matched, looks like it will be a white, pearl coat, stickers then clear coat. But there are a fair few hours left on this seat pan :/


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 26, 2017, 01:53:59
So when I removed the seat from the frame it had moulded to the frames shape a little better than I would have liked and as a result it got damaged around the sides when I was removing it ....

And then I swore .... and swore some more

Once I composed myself I assessed the damage and worked out it was because the fibreglassing followed around the underside of the tubular frame (facepalm moment)

So after hitting it with the deremel and angle grinder then the sander again I got it to fit on and off without too much

Then what I did was put thin cardboard up and in between the frame and the inside of the seat pan, in effect making a straight edge

(https://uploads.tapatalk-cdn.com/20171026/9d11ee2837324530d16b99b961f37cc7.jpg)(https://uploads.tapatalk-cdn.com/20171026/e0117c4a2568e0eea854a06175bc1bb2.jpg)(https://uploads.tapatalk-cdn.com/20171026/d786b26c348e945c4c8e731ff3e100a5.jpg)(https://uploads.tapatalk-cdn.com/20171026/dbb9cb611b0666f25502b5bc8836b2ed.jpg)

What Iíve done is cut my fibreglass cloth in strips and put it around all the bottom side of the seat pan

Once itís dry I can remove the seat and fill in the sides and edges so it goes straight down from the fall of the sides and tail instead of coming around the frame and mak ng it impossible to remove...

I swear by the time Iím finished it would have probably been cheaper to get someone to make one up custom for me. But where would the fun be in that right !


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 26, 2017, 04:28:26
The worst thing about fibreglassing is the drying time :/

(https://uploads.tapatalk-cdn.com/20171026/ab306a808e2413e3b97bcd313267a973.jpg)(https://uploads.tapatalk-cdn.com/20171026/df6c3c37b41d0b01ff06699fbc5e9e9f.jpg)(https://uploads.tapatalk-cdn.com/20171026/1c834fdbda5151f79f70fc375e3aad19.jpg)(https://uploads.tapatalk-cdn.com/20171026/36eea8a19a5f496dd832cb5ee7e2f32e.jpg)(https://uploads.tapatalk-cdn.com/20171026/604dee8b5452c616c7147a31ff35e215.jpg)

My most unorthodox and unprofessional salvage effort, Iím too far in to turn back now...

This is one side and half the tail done, I should get the other side done in an hour ..


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Oct 26, 2017, 13:15:04
It's a bit late now, but flashing plus aluminum duct tape work wonders for that sort of thing.  Flashing typically comes on a roll and is thin aluminum.  It can be easily bent in one dimension but harder to curve in 3d.  Tape is excellent for that.  I needed a a bump in a fairing belly pan once to clear a pipe bend and used a hard boiled egg in its shell to progressively push/stretch the aluminum duct tape until I had a perfect pipe clearing bump.

In terms of style, the tank ridge slopes at the sides and the seat would probably look better with a similar look. That very rear edge which is very round - like a sausage wrapped around the back and might better match the tank sharp lines if it were more edgy.  Styling is very personal and what looks right to me may look totally wrong to someone else.

Just some thoughts for the next time around.

Setting times are a function of % catalyst and temperature, but you are right that there's a lot of time wasted waiting for it to harden.

http://pinkpossum.com/GT750/phattrakka2/p8seat.htm  I used flashing and card and tape to create a "mold" to extend that seat and then used card and aluminum tape to create a one time use mold for the inner container. I make a carbon fiber wrap of that one to use for my next project.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 26, 2017, 19:11:22
Thatís a mean adaptation, it would have been nice to have started with some sort of base rather than from scratch... itís turning into an epic mission now lol
(https://uploads.tapatalk-cdn.com/20171026/adc3dc68ff1e357cf7e87814aea583fb.jpg)(https://uploads.tapatalk-cdn.com/20171026/0a81f02017be74ce9b04f8107f63c620.jpg)(https://uploads.tapatalk-cdn.com/20171026/72f769e05cb21ec1e0febc64c63ffec1.jpg)

This side built up a little quicker because I used the fibreglass matting first. This side is all but done but the tail on the other side still needs to built up

I fly out to work on the 6th Nov and itís highly unlikely this will even be in undercoat :/, no point rushing these things

Summer is upon us soon and I would love to ride this summer


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Oct 26, 2017, 22:13:53
I hear you.  Did you catch the MotoGP races at the island last weekend.  They were all epic battles. I haven't been back there since we ran the first Southern Classic there. or maybe the first GP in 89 was the last time ?  Too long ago and too many polyester resin fumes.......

Good luck with the seat.  The thing about it is that you made it and you can change it any time you want to.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 27, 2017, 00:34:17
I hear you.  Did you catch the MotoGP races at the island last weekend.  They were all epic battles. I haven't been back there since we ran the first Southern Classic there. or maybe the first GP in 89 was the last time ?  Too long ago and too many polyester resin fumes.......

Good luck with the seat.  The thing about it is that you made it and you can change it any time you want to.

This much is true,

I had my hands full with our new addition to the family unfortunately I didnít even catch it on tv- was baby wife and bike

Speaking of which my guests are due to leave shortly which means I will be returning to the garage


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Oct 27, 2017, 05:56:27
This much is true,

I had my hands full with our new addition to the family unfortunately I didnít even catch it on tv- was baby wife and bike

Speaking of which my guests are due to leave shortly which means I will be returning to the garage


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Hah! My bike time has been cut severely since my daughter showed up in the picture.  I have a project more or less mechanically done, probably about 120 to 150 hours left todisassemble, refinish everything, and reassemble, and it's been sitting that way for about 3 months now. Not too long ago ž'd have been riding it already!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 27, 2017, 06:51:16
Hah! My bike time has been cut severely since my daughter showed up in the picture.  I have a project more or less mechanically done, probably about 120 to 150 hours left todisassemble, refinish everything, and reassemble, and it's been sitting that way for about 3 months now. Not too long ago ž'd have been riding it already!

Nooooo lol, Iím on the couch now with little man asleep on my chest ... nothing more is getting done

(https://uploads.tapatalk-cdn.com/20171027/2d05eedb922f09019e7bd3839188e778.jpg)(https://uploads.tapatalk-cdn.com/20171027/e01ba062c86faeabcb1d32fe1cd937df.jpg)(https://uploads.tapatalk-cdn.com/20171027/f3c247f3f68c4defe2c83b48b16695fc.jpg)

At least all the fibreglassing is on and drying, hopefully Iíll get it sanded tomorrow

Then Iíll have to get the lines sorted Iíll need a straight edge and some time to shape it all ... Iím not expecting to finish it tomorrow although got to aim high


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Limey on Oct 27, 2017, 12:04:29
Are you planning anything for the kink at the lower/rear of the tank?  That always looks odd to my eye if its left there.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 27, 2017, 17:04:50
(https://uploads.tapatalk-cdn.com/20171027/4db6ce5397bd08c46d1471939450fd32.jpg)

Is this the bit that you mean ?

(https://uploads.tapatalk-cdn.com/20171027/4665f32d006d906368a013902ac0f103.jpg)

I too have often thought about it itís quiet a strange line to deal with I had a mate who had a welder make it straight edge but thatís going to cost $700

I could paint everything on the underside of the line black then pin stripe on between the black and the white give the illusion of the straight edge

Or I could some how make some sort of fibreglass panel to bridge the gap only issue is it would be in two parts because if I connect it to the seat pan I will not be able to put the pan on over the tank

(https://uploads.tapatalk-cdn.com/20171027/a2050d1690aed1847aa6649d1cc2a903.jpg)

Iíd actually purchased this tank for that exact same reason but the center channel is far too small and would require some welding of which I donít think either my dad or I could do


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 27, 2017, 22:16:11
Ok so Iíve given it a sand (https://uploads.tapatalk-cdn.com/20171028/d2870b2ad4f0ec6958d89cb8d2dd5eff.jpg)(https://uploads.tapatalk-cdn.com/20171028/1b1eb8da889cb011e5e6b5eef2fde01e.jpg)(https://uploads.tapatalk-cdn.com/20171028/1033e9e0a0326e2417b594ccc296ef80.jpg)

So this is what it first looked like once I got it back on the frame had to smooth it out on the inside so it sit on the rails nicely

(https://uploads.tapatalk-cdn.com/20171028/9023dad7eee4c37048804c87518df949.jpg)(https://uploads.tapatalk-cdn.com/20171028/7df1d483b3ffbad7be5ff9c31b29e1f2.jpg)(https://uploads.tapatalk-cdn.com/20171028/27ffa0a9da6508b3b3f9abb9e4322b5b.jpg)

Then I got out the spirit level and marked some lines out on it

(https://uploads.tapatalk-cdn.com/20171028/27704175b18d53d06ae603339bbe2c44.jpg)(https://uploads.tapatalk-cdn.com/20171028/1922e3c5165113c3e9f645a800899a9e.jpg)

Then I cut it but left a little wiggle room,
The sides are still not yet cut properly

(https://uploads.tapatalk-cdn.com/20171028/ea217d32578ae6ba1b628313c708b8f1.jpg)(https://uploads.tapatalk-cdn.com/20171028/c1be9baa94a24154270be07be7fbbee7.jpg)

So then I started thinking about the tank and the weird line it has at the back and thought Iíd experiment using black on the underside to give the illusion of a straight edge

Although I donít think I have the line spot on yet I definitely think this will be the way Iím going (https://uploads.tapatalk-cdn.com/20171028/00720a5a7b4db6a98441d1653d280272.jpg)

Especially against the white the contrast will lead the eye to believe its straight maybe if I can tie the seat into the tank a fraction it will be spot on


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 28, 2017, 04:54:49
(https://uploads.tapatalk-cdn.com/20171028/9edb3efbdfcb38f868091b895b135921.jpg)

I changed the black line a little it needed to come down at the front of the tank and up at the rear of the tank, itís still not spot on but much closer to where I think itís going to end up

(https://uploads.tapatalk-cdn.com/20171028/576f2c8f23ea9b007e12b56003512fab.jpg)

Iím now marking out the rear of the tail section so I can make a cut out to house the LED I wish I had a router or some thing but I think it will be caveman style brain surgery for this number then more fibreglassing... I should see if the resin mob will sponsor me and Iíll do product placement for them hopefully they will cut me a mean discount


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Oct 28, 2017, 05:44:08
Umm you should 100% have the tank modified to that. Total game changer and you will be glad in the long run.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 28, 2017, 06:14:45
Umm you should 100% have the tank modified to that. Total game changer and you will be glad in the long run.

do you mean the black on the underside of the tank, or actually have someone reengineer it ?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: innovativems on Oct 28, 2017, 12:43:31
Iíd leave the tank lines the way they are and have the front of you tail match the back angled lines of the tank to tie them together. Having the bottom of the tank with a straight line in my opinion doesnít match the aggressive lines these bikes had.  These bikes lend well to angled aggressive lines.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Oct 28, 2017, 13:07:13
do you mean the black on the underside of the tank, or actually have someone reengineer it ?

Yes, cut it and fab a new bottom.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: innovativems on Oct 28, 2017, 15:42:30
(https://uploads.tapatalk-cdn.com/20171028/2de9adfad3b57319f11331c35006e915.jpeg)

This has been the best execution for tying into that tank Iíve seen


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 28, 2017, 17:03:32
(https://uploads.tapatalk-cdn.com/20171028/2de9adfad3b57319f11331c35006e915.jpeg)

This has been the best execution for tying into that tank Iíve seen


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Iíve seen this bike it was one of a pair they did,

Iím not sure if they have raised the rear of the tank to have I carry the line of the sub frame at the back

(https://uploads.tapatalk-cdn.com/20171028/8597f5855a0eb90b0fdf641044dd10a7.jpg)(https://uploads.tapatalk-cdn.com/20171028/8597f5855a0eb90b0fdf641044dd10a7.jpg)

Also Iím not sure how they mould on the tabs that affix to the bottom of the tank without clearance issues

I had a little tan there before but it would catch on the tank each time you tried to put it on, that ok now when the paint is due to be redone but once there is a fresh coat it will be a problem.

I wish the build thread for that bike went into greater detail about how they made the fairing
(https://uploads.tapatalk-cdn.com/20171028/7bcb175eccafd3c9079a7f86e3d20cd6.png)(https://uploads.tapatalk-cdn.com/20171028/7cf506715450c09731cc8bd96d818144.png)(https://uploads.tapatalk-cdn.com/20171028/15603980c8c48e4dbf322d7a0f04c2d0.png)(https://uploads.tapatalk-cdn.com/20171028/349effe54bd23763ba12d885b0567eeb.png)(https://uploads.tapatalk-cdn.com/20171028/4fe6d50ef4d386eddeff1b7c7b82fb67.png)(https://uploads.tapatalk-cdn.com/20171028/acc9b9d86c3f46c89d282836f4c2c94d.png)

Here are a few that embraced the strange shape, some that hid it with the black underside and then the last one highlighted the strange shape by having the tank black and the underside lighter... that said their tail section was fabricated by a master, one that unfortunately I am not.


(https://uploads.tapatalk-cdn.com/20171028/bfb7ff0d4bd9175b30c68d4f034b73cc.png)

This is one of the guys from a group Iím in here in Melbourne he had the straight edge and knee indentations made, this ride is fully tricked out big bore the full 9 yards... I think his budget was bigger than mine


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Oct 28, 2017, 17:16:23
(https://uploads.tapatalk-cdn.com/20171028/2de9adfad3b57319f11331c35006e915.jpeg)

This has been the best execution for tying into that tank Iíve seen


That is super clean.  The way they connected seat to tank and then continued the style line to create a visual straight line without losing the aggressive lines is masterful. The tail is a little small but it works really well.

Plus it looks like a fairly simple extension of the seat to match the tank.  In reality, there's probably a lot of work in that seat but it works so well.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 28, 2017, 18:19:31
So so much work, like you said execution is absolutely flawless, ties in beautifully as if it was made that way.

I might have a play although im not particularly confident i could come close to this work of art ... maybe ill go visit my mate at the hardware probably thinks im building a boat with the amount of fiberglass and resin ive purchased.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Oct 28, 2017, 18:48:31
probably thinks im building a boat with the amount of fiberglass and resin ive purchased.

Ha!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 29, 2017, 02:00:43
(https://uploads.tapatalk-cdn.com/20171029/019a7d8cddd1956628a0afecb72c303c.jpg)

That moment where youíre doing your nut trying to get the shape right with your contour tool and something just doesnít add up so you recheck your centreline only to realise you must have been delirious with sleep deep when you did it the first time

The end closest to the tail is right but somehow the end of the ridge near the seat was on the piss 5 mm :/

I guess itís better to work that out now, rather than someone point it out to me after itís been painted

(https://uploads.tapatalk-cdn.com/20171029/150e1820ff4a371288ab9e0d54811e98.jpg)(https://uploads.tapatalk-cdn.com/20171029/01f7279df7caa7526262412df7439be2.jpg)(https://uploads.tapatalk-cdn.com/20171029/9fa9e02b7c10c16eed97be3a20cd1220.jpg)

So Iíve made a dam in an attempt to push the edge of the ridge over to where itís supposed to be

Just waiting for it to dry again.... better call Guinness Iím going for a few records, most amount of resin used in a single cafe race seat and most amount of reworks.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 29, 2017, 04:20:28
(https://uploads.tapatalk-cdn.com/20171029/18d14a0d89bf500eab8cd2a9e94d96c4.jpg)(https://uploads.tapatalk-cdn.com/20171029/8d1f40eb7731205fdf3c2e3ebc1808ba.jpg)

Ok so this is the ugly ridge extension, the sick looking ridge is hidden in there I just have to get it out

(https://uploads.tapatalk-cdn.com/20171029/2366e89e39b6ad68071a0328127fc65e.jpg)(https://uploads.tapatalk-cdn.com/20171029/8c0e875fa154d7c4b4564dae4949e737.jpg)

It will get there I have faith, I also built up the top of the edge on the back left because the shape didnít mirror the right

(https://uploads.tapatalk-cdn.com/20171029/38d98cf1e35a0d1944559fe08369a1c7.jpg)

On a side note I was walking the dogs today and as I was walking past a house that was being built I saw a roll of underlay in the bin

(https://uploads.tapatalk-cdn.com/20171029/f0f02ac41449ace1648b577a6fede0bd.jpg)

I had been to Clarke rubber numerous times searching for foam to upholster the seat with but could only find this grey stuff, exy and not really fit for purpose

(https://uploads.tapatalk-cdn.com/20171029/b77272147de348de88b5884966922b7b.jpg)

The underlay was thin so I cut it into squares appropriately the size I wanted for the seat
(https://uploads.tapatalk-cdn.com/20171029/24b56d68cfbe0a1596784af5f516faa7.jpg)

Then I got my trusty can of spray adhesive, and layer upon layer began to stick them together
(https://uploads.tapatalk-cdn.com/20171029/be6b2275858df6d1d27f4301df091983.jpg)

I squared it off and ended up with ...

(https://uploads.tapatalk-cdn.com/20171029/aad4446846d6ca0e629d14fa302b2636.jpg)(https://uploads.tapatalk-cdn.com/20171029/97e5f556c1b69d9b84d9938a6487a023.jpg)

This bad boy super durable cheap as chips memory type foam block ready for moulding


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 30, 2017, 03:55:08
So while I wait for another lot of resin to dry #resinking, I decided to play with ideas for the front fairing

(https://uploads.tapatalk-cdn.com/20171030/326df38c055a74d967ec6c750e841698.jpg)

I think the cardboard makes it look rather sporty, and itís so much easier to work with that fibreglass

(https://uploads.tapatalk-cdn.com/20171030/54ca9a14d42af297d474e4153752466d.jpg)(https://uploads.tapatalk-cdn.com/20171030/86d486a49b01baf88714686e3ee2a006.jpg)
(https://uploads.tapatalk-cdn.com/20171030/d75bbb2d97a4e4782af9a15f5d223762.jpg)

Iím thinking of offsetting the 3 led lights I have either off to one side or

I might see if Dad can work his magic and scale this up to house the LEDs

(https://uploads.tapatalk-cdn.com/20171030/3adfe50e58ab7122517e9e6cc01d5686.jpg)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 30, 2017, 18:41:20
(https://uploads.tapatalk-cdn.com/20171030/546bbe939e3b596fe33e23bec88dd317.jpg)

So I got a few runs in last night still rough but far better than it previously was

(https://uploads.tapatalk-cdn.com/20171030/844a21749193d4b506a56e8d95351eea.jpg)

(https://uploads.tapatalk-cdn.com/20171030/3e9d6598ac5af8e5287b7601d1f07466.jpg)

I did a shot from both sides to draw a comparison, one with the black underside one without

(https://uploads.tapatalk-cdn.com/20171030/db22e26d8f2e9363709d4e989a63bdf9.jpg)(https://uploads.tapatalk-cdn.com/20171030/0d0bbb8ad25f6a5493911732ba4e0c85.jpg)(https://uploads.tapatalk-cdn.com/20171030/9cd115ecb3af5a43d0c1a7f3cf4c46cd.jpg)

Think today Iíll mark up the position for the rear LEDs and cut that out hopefully without any issues

Sheís been a mission I hope itís worth it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Oct 31, 2017, 04:11:33


So once again I marked up the slot for the rear LED

(https://uploads.tapatalk-cdn.com/20171031/4ef0fd1640076b204880f8e20bf2194b.jpg)

Once marked up I hit it with the grinder, then the dremel and finally the file

I purposely cut it slightly smaller that I needed then worked my way out, sheís easy to cut but no so easy to put back, as I have found out again and again during this process

(https://uploads.tapatalk-cdn.com/20171031/7ca1fff7ea1461b578e0984d728c3c42.jpg)(https://uploads.tapatalk-cdn.com/20171031/7f0132a9b06fd5659558fe486db24bb2.jpg)(https://uploads.tapatalk-cdn.com/20171031/d4e8d55a5f24b5e89e8b140b7b57141f.jpg)(https://uploads.tapatalk-cdn.com/20171031/7cc3268aa4d917d10ac5f16698b90b9f.jpg)(https://uploads.tapatalk-cdn.com/20171031/9a63f15591fea59cbe07a745088d37a3.jpg)(https://uploads.tapatalk-cdn.com/20171031/a8e64eb751ceda04c95d5dca17d9afe1.jpg)

I couldnít help myself I rigged up the power to see what it would look like.

Iím liking it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Oct 31, 2017, 05:05:13
Ö Iím liking it

Looks good!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Oct 31, 2017, 13:14:17
Looks great...all the work will be worth it to have what you wanted when you finish.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 01, 2017, 07:13:40
(https://uploads.tapatalk-cdn.com/20171101/eaa03213451b9495e18f6f0deff613d5.jpg)

So Iíve been doing my nut how Iím going to tie the seat into the tank, no easy feat with these peculiar lines

First I sanded the sides of the seat back so they followed the lines of the frame

(https://uploads.tapatalk-cdn.com/20171101/f152f83500fa3a1cc6db4c23867464d2.jpg)(https://uploads.tapatalk-cdn.com/20171101/532e83176d6bf49018abea119b2dc938.jpg)(https://uploads.tapatalk-cdn.com/20171101/73097775fe9b206e5d12f86b6392ba9a.jpg)

Then I masked it up and made the cave man mould

(https://uploads.tapatalk-cdn.com/20171101/e6c922da405f9db45491912b8a2706ba.jpg)(https://uploads.tapatalk-cdn.com/20171101/ad3703ba3b9c4d3676fc050ad3a422cb.jpg)(https://uploads.tapatalk-cdn.com/20171101/3bca8363102b3ead0c246dcc1cc23324.jpg)

Then cam my favourite the fibreglassing, I must admit Iím a lot neater now with a whole lot less waste

See how it turns out in the morning


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Nov 01, 2017, 07:23:05
Looks really neat with the tail light! I say embrace the tank angle, I like the fact that it doesnít flow perfectly and itís part of what makes it stand out as an F. What youíre working on now looks promising!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: innovativems on Nov 01, 2017, 17:30:17
tying into the tank is going to look great with it.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 02, 2017, 17:06:47
(https://uploads.tapatalk-cdn.com/20171102/69c831547860b2823cbb7dd95f28e667.jpg)(https://uploads.tapatalk-cdn.com/20171102/a24e370403c4c1a1b2e6e91ea8c63d4b.jpg)(https://uploads.tapatalk-cdn.com/20171102/1a7e9be1f996ae2a7bbc2d2d2fda820c.jpg)(https://uploads.tapatalk-cdn.com/20171102/a30a7689d54c8e5080a6139f3a199c3f.jpg)

This is where itís at no work done yesterday, busy at the vet with one of the furry ones

See what magic I can work today


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 02, 2017, 20:50:11
In between coats update

(https://uploads.tapatalk-cdn.com/20171102/3796f8d0ecfad59ffb928e080f26fd34.jpg)
(https://uploads.tapatalk-cdn.com/20171102/2bc699353d7410dc924dfe7aab0366e5.jpg)(https://uploads.tapatalk-cdn.com/20171102/f7c72f18dde8f0b531c968202366ba6b.jpg)

So i prepared all my fibreglass matting and cloth

(https://uploads.tapatalk-cdn.com/20171102/56f7494b8345336d43caeabacfbf755e.jpg)(https://uploads.tapatalk-cdn.com/20171102/7274fda7bd055511d0dc3195440918cf.jpg)(https://uploads.tapatalk-cdn.com/20171102/9e8616dd1cb4de5220ca23e845ce7d03.jpg)

Then made the cave man mould for the left side of the tank

(https://uploads.tapatalk-cdn.com/20171102/a6ad974c0005999701044d9c611b9ae5.jpg)(https://uploads.tapatalk-cdn.com/20171102/25de8554e29b6c427bae6f548b77e308.jpg)(https://uploads.tapatalk-cdn.com/20171102/30376024ef3fd42eecc8477916e2390c.jpg)(https://uploads.tapatalk-cdn.com/20171102/4541beb3cd9e1b80d03d70969b71651b.jpg)

Had to fill in the right side to bring it out to match the side of the tank

Once this lot cures Iíll see how much the left side needs to be built up then hopefully itís about sanding and shaping although Iím still uncertain of the exact line these extensions should have under the tank

I had to sand out the inside of the seat pan so it went on and came off easily as before it was a little too snug and I had to put the back on first the force down the end closest to the tank, this would have meant scratching the paint. Now it can be removed and replaced without that issue.

Fingers crossed I took enough out that once the left side is on it still comes off, otherwise Iíll have to undo all my hard work






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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 02, 2017, 23:37:52
(https://uploads.tapatalk-cdn.com/20171103/8af036ff352ef04274c01291235082f7.jpg)(https://uploads.tapatalk-cdn.com/20171103/bde3547e6987bbb7aaebf26243306a62.jpg)

Right side

(https://uploads.tapatalk-cdn.com/20171103/6584a0b62138e0b98606a27fc9a228fe.jpg)(https://uploads.tapatalk-cdn.com/20171103/3830b7464276ba021827d7e07790f827.jpg)

Or the left side, the left side follows the line of the tank more


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Nov 03, 2017, 00:16:17
the left side follows the line of the tank more

this!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 04, 2017, 06:34:55
So I got some shed time this afternoon.

I sanded the seat back and got the lines underneath the tank to match, but then I realised see that the side fairings that I made sit proud of the tank too much.

So Iíve built it up from behind so I can sand it back and then the fairing will be flush with the tank, so far Iíve only built up one side Iíll have to get to the other tomorrow.

Iím fast running out of time before fly out day :/ unfortunately these things canít be rushed


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 05, 2017, 03:30:20
(https://uploads.tapatalk-cdn.com/20171105/1279af59f9414f699193e22f35a5a4d8.jpg)(https://uploads.tapatalk-cdn.com/20171105/e84d5b7a00f65dc5d7341cc8cec15999.jpg)

So I needed to build up the side fairing so it would match the line on the underside of the tank as it was out by a few mm

(https://uploads.tapatalk-cdn.com/20171105/17301248024095ddc8e0f835382fa68e.jpg)(https://uploads.tapatalk-cdn.com/20171105/67f16f15444a25a01ce09c6745cba843.jpg)

I had some left over resin so whilst the seat was on an angle I poured it so that it would smooth out the lines of the curve as they had always been a little uneven

(https://uploads.tapatalk-cdn.com/20171105/faeba9ff611769c84570a2f0387562a0.jpg)

Once the resin had set I removed the gaffa tape and began to slowly skim the top off the fairings until I had the right line

(https://uploads.tapatalk-cdn.com/20171105/07b0ae089ff3ab965e36c62a5c2c9051.jpg)(https://uploads.tapatalk-cdn.com/20171105/1157eb0f33a400b85066c3c1a35c6156.jpg)

I think Iíve got it now

(https://uploads.tapatalk-cdn.com/20171105/717199b91fb248febc2c99a62bc8d016.jpg)(https://uploads.tapatalk-cdn.com/20171105/c6ccc1bee49dee65981aa98b999ca96b.jpg)(https://uploads.tapatalk-cdn.com/20171105/c2850132ad7bff3a250b523d8f0b1abe.jpg)(https://uploads.tapatalk-cdn.com/20171105/a9bc250285431cbca643937b53d5313b.jpg)

Then I sanded in the sides more to match the tank

(https://uploads.tapatalk-cdn.com/20171105/bdd81f966cf26eebed0b9f93a9ce6fde.jpg)

The I rounded off the top of the seat pan that marries up to the back of the tank

Iíve tried a few times to replicate the angle I had before on the left hand side an I just canít seem to nail it, so itís time  for me to pull stumps for the day and come back to it again tomorrow I donít want to fuck it up because Iím tired, it takes too long to fix

Tomorrow Iíll match up the cut outs for the rear shocks then try to get the ends of the fairing to tie into the lines on the tank

(https://uploads.tapatalk-cdn.com/20171105/24e1e14b94a09341ffef575b6dad236e.jpg)(https://uploads.tapatalk-cdn.com/20171105/4b0436ce6c1bba9e1574fbc95f2f1269.jpg)(https://uploads.tapatalk-cdn.com/20171105/10e88c5ded71d56b133b3f4c4585274d.jpg)(https://uploads.tapatalk-cdn.com/20171105/9e003da8ff99dcb51fca4eab6244aaa3.jpg)

Just a few shots of the bike in full


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Nov 05, 2017, 04:13:12
You certainly deserve a prize for perseverance!

Several times I thought you had a fail on your hands, but it seems you have nailed it after all.

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 05, 2017, 04:59:30
persistence is the mother of all skill they say
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Nov 05, 2017, 05:06:13
persistence is the mother of all skill they say

True!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 05, 2017, 22:29:08
So this morning I managed a little more shed time

The cut outs for the rear shocks have been doing my head in because they are different shapes.

I was trying to work out how I was going to get the cut outs the same

(https://uploads.tapatalk-cdn.com/20171106/af43eb8cfa6e2d677f3f3954e8184d2b.jpg)

I went to the recycle bin and found an ice cream tub lid

(https://uploads.tapatalk-cdn.com/20171106/1d2e6e0e08ec7a9dd1a4477957774eee.jpg)

I squared it off and put on a centre line (hopefully itís better than the one I used on the the seat)

(https://uploads.tapatalk-cdn.com/20171106/d7067149d5e090dcb4dc331845cc88ab.jpg)

Then I drilled out a hole the same diameter as the rear shock mount
(https://uploads.tapatalk-cdn.com/20171106/ab722f27d30b88d7f2477d0a191c08e4.jpg)

Then I drilled out a small hole for my pencils to go through ... boom cave man compass

(https://uploads.tapatalk-cdn.com/20171106/db4c1f5c2c135db657f67c3c494eca12.jpg)(https://uploads.tapatalk-cdn.com/20171106/9eeb621d8a330906e2b0b8fc5c1e5083.jpg)

I hit it with the dremel and it finally came out as close to exact as I think Iím going to get

(https://uploads.tapatalk-cdn.com/20171106/2d0ef0fd2b1c47af206c88ff3461fd19.jpg)(https://uploads.tapatalk-cdn.com/20171106/111d220941d2bd362a4ccb81480f23e0.jpg)

Next I marked up the underside of the seat pan and where I was going to trim the side fairing to

(https://uploads.tapatalk-cdn.com/20171106/1dd84f8e72449a8b4398f78a0e85b501.jpg)

I sent the straight edge photos to my old man for his opinion and he told me to use the radius of the tape to gently round the edge as a straight cut will form a weak point

(https://uploads.tapatalk-cdn.com/20171106/bd0941f907badfc8042a5e5c9ed60315.jpg)(https://uploads.tapatalk-cdn.com/20171106/ea9fdae28921db39f03ba3bec2a8b5cb.jpg)(https://uploads.tapatalk-cdn.com/20171106/90df99c496080e795904e9b9feabf9c8.jpg)

Iím digging it

(https://uploads.tapatalk-cdn.com/20171106/c28ae071c122cc1934f0f0d47a02acfe.jpg)

Itís all down to this last cut and I just canít seem to get it spot on, so Iíve come in for some lunch.

Iím hoping when I go back out to the garage sudden my inner Michelangelo is released and I work some magic lines


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Nov 06, 2017, 02:54:12
You're effort with this is quite impressive, and I think the end result will be as well.  ;D
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 06, 2017, 05:05:21
You're effort with this is quite impressive, and I think the end result will be as well.  ;D

I hope so, this bloody seat has nearly taken as long, as itís taken me to get the rest of the bike to where it is now .

This has definitely been a learning experience.

At the end of this I think Iím going to make up a DIY for making a seat out of fibreglass, a summary of all the things Iíve learnt and how to avoid all the mistakes I made (of which Iíve made many)

Iím clocking off for the night, back at it tomorrow for some more sanding :/ hopefully get it ready for some spray putty


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Nov 06, 2017, 15:46:19
I'm still following along, hoping to learn because I want to try making a seat or two as well.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Nov 06, 2017, 20:32:46
Ever thought to make a plug and mold to get it right? Probably would have been way less hassle.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 06, 2017, 21:19:17
Ever thought to make a plug and mold to get it right? Probably would have been way less hassle.

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I couldnít purchase the right kind of foam to shape, even at Clarke rubber which is the go to for foam products here

Thatís why I ended up using thin cardboard which was less than ideal

But I wouldnít have had nearly as much fun doing it that way, plus I was worried with the economy being the way it is if I didnít keep purchasing resin and fibreglass that the companies may go under without my support


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Nov 06, 2017, 21:26:59
I couldnít purchase the right kind of foam to shape, even at Clarke rubber which is the go to for foam products here

Thatís why I ended up using thin cardboard which was less than ideal

But I wouldnít have had nearly as much fun doing it that way, plus I was worried with the economy being the way it is if I didnít keep purchasing resin and fibreglass that the companies may go under without my support


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Yes, I have read that the fibreglass industry is doing quite well now, thanks to you.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Nov 06, 2017, 21:29:37
I couldnít purchase the right kind of foam to shape Ö

Florist's green foam blocks are OK.

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Nov 06, 2017, 21:31:28
Ever thought to make a plug and mold to get it right? Probably would have been way less hassle.

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Did you see this?

http://www.dotheton.com/forum/index.php?topic=74820.msg888690#msg888690
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 06, 2017, 21:42:56
Florist's green foam blocks are OK.

Crazy

I totally should have used that (insert some kind of face palm emoticon)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 06, 2017, 21:56:57
Did you see this?

http://www.dotheton.com/forum/index.php?topic=74820.msg888690#msg888690

Level plus

Clay would have been far easier to work with

Luckily I can skip the carbon fibre sheets as the fibreglass is so thick, probably added another 10kg to the overall weight of the bike


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Nov 06, 2017, 22:59:25
probably added another 10kg to the overall weight of the bike

Helps maintain traction!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Nov 06, 2017, 23:44:42
Did you see this?

http://www.dotheton.com/forum/index.php?topic=74820.msg888690#msg888690
Yep but who has the back end of a car laying around that could double as a flower pot?

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Nov 06, 2017, 23:48:52
I couldnít purchase the right kind of foam to shape, even at Clarke rubber which is the go to for foam products here

Thatís why I ended up using thin cardboard which was less than ideal

But I wouldnít have had nearly as much fun doing it that way, plus I was worried with the economy being the way it is if I didnít keep purchasing resin and fibreglass that the companies may go under without my support


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Good answer. I made a plug for my seat but said heck with the fumes and dust to do the mold. Fiberglass is nasty and easy all in one package.
On a serious note, the bike is coming out nice. My dad has an F model and if the engine wasn't trash, I'd go snatch it up from him.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Nov 07, 2017, 00:31:04
Yep but who has the back end of a car laying around that could double as a flower pot?

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Ha ha, hilarious!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 07, 2017, 01:56:36
Good answer. I made a plug for my seat but said heck with the fumes and dust to do the mold. Fiberglass is nasty and easy all in one package.
On a serious note, the bike is coming out nice. My dad has an F model and if the engine wasn't trash, I'd go snatch it up from him.

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Youíre dam right about nasty, I wear coveralls,mask and rubber gloves the neighbours probably think Iím some sore of weirdo... even more than they previously did.

The dust is everywhere I just did a big clean up vac first then hit it all with compressed air then do it all over again I think once Iím finished the dust will take a will to get rid of.



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 07, 2017, 06:03:51
(https://uploads.tapatalk-cdn.com/20171107/89b6fdd032e2e5bdd929bdc64a9587c2.jpg)(https://uploads.tapatalk-cdn.com/20171107/0fc07f10e82a8234d971a63ceb1b5b95.jpg)(https://uploads.tapatalk-cdn.com/20171107/fecebbe50b8f5bfe30b0d06541a914ef.jpg)(https://uploads.tapatalk-cdn.com/20171107/4b706531e2b1617435ca167e1f4b3bb8.jpg)(https://uploads.tapatalk-cdn.com/20171107/c8637577bf6b47916f250152bf5ed05c.jpg)

So I taped up the sides of the seat and poured resin on the top of the pan to level it out again

Then I filled in the sides to give it a little more of an edge and less of a rounded look

(https://uploads.tapatalk-cdn.com/20171107/3e286bda866169b60392cb67c4cd4a48.jpg)(https://uploads.tapatalk-cdn.com/20171107/405ce3987874e08e644933441195a347.jpg)

I graves the gaffa tape and masked up the top and sides of the seat to make a seat pan for the upholstery

(https://uploads.tapatalk-cdn.com/20171107/6c96474abb2763f57740311cb61efc88.jpg)

Then I got my fibreglass cloth cut it to shape

(https://uploads.tapatalk-cdn.com/20171107/0f5eaf6ea1ba984cf9e8ac2be9dac321.jpg)(https://uploads.tapatalk-cdn.com/20171107/38ce6be12b90dcc82fc41fcc9508ea6a.jpg)

Then I hit it with the resin

(https://uploads.tapatalk-cdn.com/20171107/eb96420d023cebbf692f8810d3160c1b.jpg)

This gave me the base to work with

(https://uploads.tapatalk-cdn.com/20171107/894c35b59555e9da7274c226612041f8.jpg)

I put it onto the bench and put another two layers of cloth on and waited for it to cure before I would trim it to shape

(https://uploads.tapatalk-cdn.com/20171107/d4993b5cbba9db1366bad513363cebe7.jpg)(https://uploads.tapatalk-cdn.com/20171107/b7830701bb710a7f5fbc22bdec8afe8e.jpg)(https://uploads.tapatalk-cdn.com/20171107/ea261a3ec11974423ddbc58d43a585cf.jpg)(https://uploads.tapatalk-cdn.com/20171107/86852f460d49b529365c64d84271765d.jpg)

It came up pretty good, tomorrow Iíll attempt to put some foam on and cut it to shape.

I still havenít cut the end of the fairings yet, I just canít seem to the angle looking right to my eye, best to do other stuff

Iím going to need to work out a way to attach the upholstery to the seat Iím leaning towards Velcro




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jag767 on Nov 07, 2017, 06:32:23
You're getting better at this lol. By the time the seat is done you'll have gotten past the learning curve, just to forget half of what you learn by the next time you do it  :o  ;D. Nice work
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 08, 2017, 06:04:34
(https://uploads.tapatalk-cdn.com/20171108/50f1b94395f96e7445735a56fd1ede6b.jpg)(https://uploads.tapatalk-cdn.com/20171108/9288f9a20a3a3134f78aaa77f6c92bd6.jpg)

So I cut some of my scavenged underlay to size and stuck it down

(https://uploads.tapatalk-cdn.com/20171108/b2638f535a32e5533f2eb040145ded32.jpg)(https://uploads.tapatalk-cdn.com/20171108/b23e7ba94a6d2093327e57ad0fd46764.jpg)(https://uploads.tapatalk-cdn.com/20171108/b7651806797a283cfde47cdea13e3d8b.jpg)(https://uploads.tapatalk-cdn.com/20171108/2700ef693968347ea9d68c0ee46b8ba4.jpg)(https://uploads.tapatalk-cdn.com/20171108/2700ef693968347ea9d68c0ee46b8ba4.jpg)

Unfortunately after ďdecontaminating the garage and trying to purge out all the fibreglass dust. This is as far as Iíve got

If Iím lucky the wifey may get a chance to sew up the leather to upholster the seat, but I dare say my young fella will see to it she has no time.

I still didnít get the end of that front fairing cut I just wasnít feeling so Iíll have to let it sit for the next six months

When I come home Iíll have to prep it for paint. Iíll also need to get some tracing paper because I need to trace the blue decal off the tank for my brother to replicate... Iíve searched and have been unable to find them like that ... if anyone here knows where I can get them in that blue I would be most thankful

Anyway time to pack the bags... still have to wake up early and wash the cars that are covered in fibreglass dust before I can fly out.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Nov 08, 2017, 10:00:53
Impressive work (and perseverance) and itís paying off!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 20, 2017, 05:44:46
(https://uploads.tapatalk-cdn.com/20171120/e37ceb3e9842d33d384547066efbeb0f.png)

So I just saw this on another build here where the guy made the switches up himself,

Iíll have to purchase some micro switches then work out how many switches I need.

Left would be;
High beam
Low beam
Indicator left
Indicator right

Right
Start
Stop
Horn

I think thatís it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: clem on Nov 20, 2017, 08:37:45
Just FYI, when I got the tank decals from reproduction decals for my bike, they did do custom colors. It was a little more in price but they will do it, just have to contact seller/manufacturer and verify that they will work with you.

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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 20, 2017, 15:32:48
Cheers Clem


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 22, 2017, 00:47:10
So being stuck away from the garage for weeks at a time means the eBay account cops a thrashing

(https://uploads.tapatalk-cdn.com/20171122/a947ea44805c469cf9a8a1cef104a8a8.jpg)(https://uploads.tapatalk-cdn.com/20171122/0b7c1019a355044dbd80ca1bbb7672c9.jpg)

So I ordered a second hand tank rubber but when it arrived there was a huge hole in it, I contacted the seller and they offered a replacement

(https://uploads.tapatalk-cdn.com/20171122/7eafc67c7cc0856a863b061983f11465.jpg)(https://uploads.tapatalk-cdn.com/20171122/de279a7c5bcc8a0ac1faa537d05e1518.jpg)

This one is in far better condition

(https://uploads.tapatalk-cdn.com/20171122/902871656bcb00e4667d55900361474b.png)
(https://uploads.tapatalk-cdn.com/20171122/77f643163ebd8e8d125829404b17a018.png)
(https://uploads.tapatalk-cdn.com/20171122/ae6fcd9ecdae8b971a1094188ba902b8.png)

Next thing I went on the hunt for was these micro switches, they were about $17 a pop. Iím hoping this will turn out as well as the ones in the photo

Although I doubt we will get it done this Xmas break still have to fab bracket to mount the damper, gear linkage, front fairing and then the switch mounts lol

Here I was thinking id be riding Frankenhonda this summer


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 22, 2017, 00:49:27
(https://uploads.tapatalk-cdn.com/20171120/e37ceb3e9842d33d384547066efbeb0f.png)

So I just saw this on another build here where the guy made the switches up himself,

Iíll have to purchase some micro switches then work out how many switches I need.

Left would be;
High beam
Low beam
Indicator left
Indicator right

Right
Start
Stop
Horn

I think thatís it


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This build is by a guy called coopacoopaco... pretty sweet build heís working on


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 22, 2017, 06:34:49
Sorry it was darkness78 cb750 that was the user name


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Nov 22, 2017, 09:59:36
Not quite as fancy, but cheap

https://www.ebay.com/itm/7-8-22mm-Motorcycle-Bike-Handlebar-On-Off-Button-Head-Spot-Fog-Light-Switch-US/112087629076?epid=1181742369&hash=item1a18f17d14:g:3~EAAOSwV0RXqXC6&vxp=mtr

https://www.ebay.com/itm/7-8-Motorcycle-Atv-Pit-Bike-Horn-Lights-Turn-Signals-Switch-On-off-Button/252794729841?hash=item3adbbd7571:g:-qsAAOSwfVpYuCJE:sc:USPSFirstClass!60060!US!-1&vxp=mtr

https://www.ebay.com/itm/7-8-Motorcycle-Dirt-Bike-Handlebar-On-Off-5-Button-Head-Spot-Fog-Light-Switch/352174306328?hash=item51ff397418:g:EIMAAOSwynRZzKAb&vxp=mtr

https://www.ebay.com/itm/22mm-Motorcycle-Handlebar-Mount-Switch-Headlight-Brake-Fog-Light-ON-OFF-Button/292325096592?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D41375%26meid%3D0657bb1fa6344ba8874f8bf47462d500%26pid%3D100508%26rk%3D1%26rkt%3D1%26&_trksid=p2045573.c100508.m3226

And there are others.

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 22, 2017, 14:48:03
Ah nuts Iím committed now theyíre already posted


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 24, 2017, 07:10:08
(https://uploads.tapatalk-cdn.com/20171124/edd4fbb390a24c46c6c2f0024866ce71.png)

I was looking for some inspiration for the damper mount came across this mean setup, no chance of a tank slapper on this ride


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Coopacoopacoopa on Nov 25, 2017, 16:35:31
This build is by a guy called coopacoopaco... pretty sweet build heís working on


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Your thread answered the question I was asking him in his thread! Too funny.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 25, 2017, 18:20:08
always glad to help
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Nov 26, 2017, 17:22:52
(https://uploads.tapatalk-cdn.com/20171126/862edfa47a1fe95ce1fa6019ad79b946.png)

Always the way after you make the purchase you come across something cheaper

Seriously Indonesia is heaven for cafe race builders everythingís is so cheap


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Dec 06, 2017, 03:09:35
(https://uploads.tapatalk-cdn.com/20171206/346261acf42dfbccbf5e67fb1d848d60.jpg)

Micro switches .. check


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Dec 27, 2017, 04:25:36
So only had a two week break, and the newest addition to the clan has managed to keep me pretty busy so progress has been slow at best

Because I couldnít find the stickers anywhere Iíve decided to get my brother to make them up. But first he needed a template.

(https://uploads.tapatalk-cdn.com/20171227/01f3b2b8dc5f11dbae37ba714e9ed817.jpg)

So out came the butchers paper, after a few lines it became apparent to me that I will never become a brain surgeon.

(https://uploads.tapatalk-cdn.com/20171227/8ea1a4f32cbc8898451c415e6eb8b41c.jpg)

(https://uploads.tapatalk-cdn.com/20171227/e5928fbb55d4f8f4ff7b603704cd19bd.jpg)

After scrawling like a reforming alcoholic for a bit I managed to come up with something that vaguely resembled the decal

Iím not expecting much more progress this break as I fly out on the first :/ unfortunately I havenít got anyone to sponsor my motorcycle addiction so Iíll have to keep on working.






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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Dec 31, 2017, 03:21:35
So I thought Iíd try my hand at making a tray for the battery and electrical harness out of ..... fibreglass.

I should have known how this would end up but Iím a glutton for punishment , but this is all about sharing.

(https://uploads.tapatalk-cdn.com/20171231/8880b0a34b8fc4a1ec982401d7149fc4.jpg)(https://uploads.tapatalk-cdn.com/20171231/2852b9ec6ea9b12bead7f7c64ade9946.jpg)(https://uploads.tapatalk-cdn.com/20171231/fd32c0e0e2d0c38aa01419043f5e06e3.jpg)

So it all starts pretty well, I kept telling myself preparation is everything
(https://uploads.tapatalk-cdn.com/20171231/588ecffc611c2d9f71d31e498508cf3b.jpg)

Checked all the components would fit, seemed a little tight (a little too tight in hind sight)

(https://uploads.tapatalk-cdn.com/20171231/bee9798afbcc48aa1c291c8668bb2989.jpg)

Then I used some wax as a releasing agent and began the fibreglassing

(https://uploads.tapatalk-cdn.com/20171231/41b27b9018edf4bec78fc9f6d8993c3b.jpg)

I put some steel straps in for additional support

(https://uploads.tapatalk-cdn.com/20171231/31506f52c5a5695f9de2349923b483da.jpg)
(https://uploads.tapatalk-cdn.com/20171231/02cea8f85535749af9219d5952e7a117.jpg)

Came out pretty rough as I was trying to lay down the fibreglass in a tight spot and was having difficulty getting it to conform to the shape of the mould

(https://uploads.tapatalk-cdn.com/20171231/8dd6b1a38aecbb215905294aea2a3faf.jpg)

Then the battery was too tight booo

(https://uploads.tapatalk-cdn.com/20171231/5d0e0cff0fb9c2d7f47aca30c84aec3f.jpg)(https://uploads.tapatalk-cdn.com/20171231/59ab8c66836a85f9fbf2b61c605b46c9.jpg)

Itís too rough for my liking so I think I will look at fabricating it out of steel using this for measurement and as a guide

Oh well fly out tomorrow so Iíll have 6 weeks to conjure up a new method


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: djmaynard on Dec 31, 2017, 12:31:26
Looks like a good guide for the steel attempt. Live and learn my friend.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Jan 02, 2018, 01:44:59
(https://uploads.tapatalk-cdn.com/20180102/8324843f363a5a6d665b58c0e9f7da4f.png)(https://uploads.tapatalk-cdn.com/20180102/7e3c489e1d8998e1e57c9efbb0f84613.png)

Finally found some good photos for the dampner mount, a little more involved than we had first anticipated.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LKS on Feb 04, 2018, 16:01:41
This is an awesome thread! Excited to see what numbers you end up with, with regards to height under engine, rake and trail. I have the same fork as you, but I'm building a Suzuki GS750.

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 05, 2018, 04:02:44
This is an awesome thread! Excited to see what numbers you end up with, with regards to height under engine, rake and trail. I have the same fork as you, but I'm building a Suzuki GS750.

Cheers, the hand brake has been on for a bit with the introduction of Jnr, and Work.

Maybe when I go home Iíll measure the rake and trail, Iím another week from flying home.

Luckily My old man has been chipping away at a switch assembly

(https://uploads.tapatalk-cdn.com/20180205/c3adcfb150736d56807d037453d6542e.jpg)

This was the base shape

(https://uploads.tapatalk-cdn.com/20180205/2383e1bcee070d09795559b489f8949e.jpg)

Then he housed the micro switches

(https://uploads.tapatalk-cdn.com/20180205/4381e09a44ef6b6ad7781130651eb8b3.jpg)(https://uploads.tapatalk-cdn.com/20180205/a454246ab9d23506ae7d566c3a85dbec.jpg)

Tapped the thread for the two clamping bolts

(https://uploads.tapatalk-cdn.com/20180205/10f874a907a96bb8d0cfa41b716e17fe.jpg)

Then had to come up with a plan on how we would run the wires

(https://uploads.tapatalk-cdn.com/20180205/da7b0cd6658948209c60f6d9dceaef99.jpg)

Ended up running a channel on the underside which will exit through a single hole on the inside of the housing

Just trying to find some cheap flexible steel cable to run the wiring through

Dad found a 15m for but itís like $167 bit exy

Still have to finish shaping them then finally anodise the housing black

But itís looking pretty cool,


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 12, 2018, 08:21:10
Bit more shaping has been done to the switch housing, nearly there Iíll be home tomorrow so Iíll have to remove the top triple again so we can skim the top of it flat


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 15, 2018, 02:33:06
Theyíre coming along just need to find someone in Melbourne that can etch in the logo


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 18, 2018, 04:59:43
So finally got into the shed with old man Murphy, we had to finish the internal channels on the underside of the housing so the wiring will be discretely run on the underside of the handle bars. Hopefully without getting squashed.

So into the mill and a little at a time we deepened the channels until the wiring would fit

So next was the test rub for the left hand switch block

Using the dummy handle bar the left hand switch block seemed to work

Once these have been etched and anodised we may even use resin to hold the wires in place still undecided

Both switch blocks on the dummy bar

Next I wanted to take the scratched out of the top of the triple

We set it up then skimmed the top

Came up good need to get it hydroblasted then engraved, anodised then Iím going to fill the engraving with gold powder coating same as the rims should look the goods hopefully.

Now I need to clean the shed before I can start working again then Iíll polish up the switch blocks

May even mock it up on the bike too, just to see how it looks





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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 18, 2018, 14:34:35
Lookin' slick, Slick ;)
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 19, 2018, 17:37:27
Unfortunately the only op


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 19, 2018, 17:38:20
Unfortunately the only op


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Only. Progress was cleaning the shed yesterday


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 19, 2018, 20:38:32
Looks like sheíll take lefts better than rights


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Maritime on Feb 20, 2018, 10:14:04
That's still a pretty good lean angle.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Feb 20, 2018, 11:08:13
Don't forget that when cornering, the suspension is compressed a fair way -  so less lean angle available.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Feb 20, 2018, 23:39:03
Don't forget that when cornering, the suspension is compressed a fair way -  so less lean angle available.

Plus much of the time there is a rider on top.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 21, 2018, 05:10:12
at this rate by the time I'm finished I may be too old to get a leg over it
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Feb 21, 2018, 14:01:23
Looking good! Sure the real lean angle will be smaller but considering the lowered front that looks pretty good. A lot of nice work put into that bike too!


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 21, 2018, 17:58:47
If you can imagine the top triple and switch block housings are anodised black, itís nearly there

Still want to finish the rear fairing the. Tackle the front fairing

Slow runs


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 23, 2018, 03:04:08
So Iíve been tackling the rear seat, sheís had a rough finish for quiet some time and needs to get prepped to spray

(http://)

After sanding it with some 1200 grit I gave it a coat of filler just so it was more uniform to the eye and easier to spot the imperfections (there were a few

(http://)

Then went back to sanding then got some bog to fill in some small air bubble holes that had become apparent after spraying it

Then I rubbed it back with some 800 then 1200 grit again before respraying the filler

Itís nearly ready I just need to cut the ends of the fairing near the tank so it all ties in

Then hopefully my brother will have finished the decals so we can get this bad boy sprayed



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Maritime on Feb 23, 2018, 08:26:55
Nice, looks good. always good to mirror the tank and I like the way you tied it into the tank at the bolt point to clean that up.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Feb 23, 2018, 10:11:05
Looks Great... only thing I would change is to taper the seat panel to the same angle as the tank where they meet. Just my 2 cents  Edit: Oops...might help if I read it all huh..lmao Keep on keeping on !
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 23, 2018, 10:32:26
Dude that is one of the nicest, cleanest and most stylish seat cowls I've ever seen.  Kudos man, looks really great.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 23, 2018, 22:12:24
Thanks for the feed back guys.
Iím finding it really difficult to tie into the angle of the tank as it keeps changing the whole way along there is no clear angle if you know what I mean.

In between sanding on the seat I thought Iíd have a look at this front fairing
(http://)

Got myself some clear Perspex with the idea that when Iím painting it I can mask of where I want the small windscreen and it will all just be one continuous piece

(http://)

So this is the rough shape

(http://)

Then out with the heat gun (http://)

And the only thing I could find for a rough curve an old keg that I had tried to turn into a small spit.

(http://)

(http://)

(http://)

Sheís a bit rough but it was just a test run I wasnít sure how easily it would shape but with the heat gun and the right mold I believe it would work a treat.

I have small round led lights about 47 mm diameter 3 of them Iím not sure how I will run them offset to one side, verdicts still out,

I may even abort the small LeD opting for a larger light, I kind of like the idea of the front fairing looking like a racing number for the original racing versions




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 23, 2018, 23:24:40
You can see where Iíve masked up my n the rear seat fairing the right side of the bike seems to look better

Iím unsure if this is because of the black Iíve run on the underside of the tank on the right side or if I have the angle slightly different

The front fairing still isnít what I want just yet watch this space


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 24, 2018, 01:58:19
Well after a boat load of procrastination itís done I made the cut there really is no turning back from here

I think Iíll have to run with the black line on the underside of the tank


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Feb 24, 2018, 04:10:11
I made the cut Ö

Well done!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 24, 2018, 10:37:27
Itís a tricky tank shape no doubt. Me I love the irregular shape and I think youíve worked the cowl and seat into it really well. Job done fella, and done well. Really looking forward to seeing this great looking ride all buttoned up


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 26, 2018, 01:54:58
Ok so Iíve gone away from the Perspex option for the front fairing.

After a discussion with the Old man on my Perspex attempt at the front fairing, we both were in agreement that my first attempt was a little cactus

The shape was wrong (a little too square) and not in character with the tank and the rear tail section which both have a ridge running down the centre line

So in true Frankenhonda fashion the Old man suggested using fibreglass and the tank as a template for the ridge and the mould of the front fairing

So first I masked up the tank then built up the sides with cardboard in a rather rudimentary attempt for a mould

Then I played the fibreglass cloth down and let rip









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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Feb 26, 2018, 08:03:14
That is a neat idea.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 26, 2018, 09:25:49
Nice work mate, really creative. Very much like how youíre incorporating the challenges of that tank into the rest of the bike in a very coherent whole.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 26, 2018, 10:31:49
I did some fibreglassing on my old VW bus which ended up being an abomination - what you're doing here is pretty inspiring.  I might have to give it another go...

Mate I don't want to sound like a dick or anything but I noticed the cylinder head intake and exhaust ports don't have any shop cloths stuffed into them to stop any shit falling inside.  Just thought I'd mention it in case.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Feb 26, 2018, 15:27:04
Cool idea, that looks promising. You can start doing fiberglass professionally when this build is done


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Feb 26, 2018, 16:14:46
Just a thought, but if you took a straight line from the bottom of the seat to front of the tank and painted it black below that line, would that work with the tanks side shape? It might just disguise the shape enough to provide that table top look as I call it.

Or just copy the way that the CB900 in the shout box did it to tie the two lines together.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 26, 2018, 17:34:53
I did some fibreglassing on my old VW bus which ended up being an abomination - what you're doing here is pretty inspiring.  I might have to give it another go...

Mate I don't want to sound like a dick or anything but I noticed the cylinder head intake and exhaust ports don't have any shop cloths stuffed into them to stop any shit falling inside.  Just thought I'd mention it in case.


Fair call it was covered up until this break, luckily this time around all my sanding has been done wet out side the garage.

But I should definitely stuff something in there I donít think fibreglass dust helps combustion any


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Title: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 26, 2018, 17:38:10
Just a thought, but if you took a straight line from the bottom of the seat to front of the tank and painted it black below that line, would that work with the tanks side shape? It might just disguise the shape enough to provide that table top look as I call it.

Or just copy the way that the CB900 in the shout box did it to tie the two lines together.

I believe I will probably tackle that line last, it definitely wonít be happening this break. Iíll add it to my ever increasing list of further modifications required


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 26, 2018, 23:10:49
So this is pretty rough, and who knows how many weeks from finished. But this is the loose idea

I havenít done anything other than free it from the tank and cut out a rough shape

(Rookie error #209 always use releasing agent)

There is a heap of work to come plus need to figure out how Iím going to put it I put one photo in with it spun around

Last few sketches are from Old man Murphy explaining the angle that the front fairing should be placed on, so the angles decided just have to imagine the right shape now




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on Feb 27, 2018, 00:32:23
With all due respect to whoever Old man Murphy is, someone is being really silly here.  There is no "pivot point" that's BS from a design point of view and has little or no relevance IMHO.

What are you looking for? I know you don't have the final answer of all answers, but what have you seen that you like? What do you want it to look like.  BS about bone lines and pivot points is just not part of the discussion.

One often wants a slight rake angle on a front number plate.  Why? because it helps in some small way to direct air over your head, but too low and it simply causes air to crash into your chest or worse your head.  It "looks" right because that's what Norton and others used to do before fairings were more common and they did it to get a small improvement in drag when tucked in on the tank at the IOM.

For the rest of us in the real world, all we want is something that looks nice and that's a totally personal choice.   On the Phat Trakka, I tried a couple of cheap aftermarket headlamp-fairing arrangements and they sucked.  What I wanted on that bike was a front number plate that looked somewhat reminiscent of a Flat Track bike, so that's where I looked for design inspiration.

In the end I couldn't find a shape there that worked but noticed that a couple of Motocross or dual sport bikes had interesting shapes of front plates and that's the shape I adapted.  I took an 8x11 white plastic side number plate and bent both sides back with a heat gun and a piece of wood to act as a former.  Then I trimmed the bottom and top of the sides to get a more hexagonal sort of shape and then cut holes for the headlamps and mounted it parallel to the fork tubes. 

http://pinkpossum.com/miscbikestuff/PT-2.jpg

That may not be the look you are going for but hope it gives you a place to start thinking.


Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 27, 2018, 00:56:06
Dude you drop that thing a few inches and chop about 5Ē off the bottom, could be in business


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Feb 27, 2018, 01:54:34
So this is pretty rough Ö

It looks like you could be on the right track.

(don't listen to all this talk about trash cans!)

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 27, 2018, 04:30:26
It looks like you could be on the right track.

(don't listen to all this talk about trash cans!)

Crazy


Lol all good, all for constructive criticism, unfortunately Old man Murphy, is my old man and heís got the street cred with me, the sketches are just how he explains stuff


Based on that the angle is sorted

Now what Iím doing is narrowing the fender, or actually I guess Iím making it more rectangle

Once I have the front shape sorted Iíll look at building the underside and sides

Unfortunately itís a little too late for me to break out the angle grinder as jnr is going down for his nap, unhappy baby = unhappy wife = unhappy life so Iíll pack it in for now come at it first thing tomorrow


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Feb 27, 2018, 11:45:10
Not sure if this helps but your fairing made me think of this one, the angle may work for you.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 27, 2018, 23:52:20
So today I got out the angle grinder to try and release the fairing that was hidden within the fibreglass

Iíve cut it into a nicer shape I can see I will still need to build the top section up to create more of a rectangle

I also propped the top out a little further as before it was basically resting upon the instruments

Slowly starting to come to life if the seat is anything to go by I should nearly be done in another 8weeks


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: MiniatureNinja on Feb 28, 2018, 00:57:41
much better! almost looks like a starwars droid or something. are you going to do a single headlight in the center or the projector beams/led offset or something?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 28, 2018, 01:11:58
much better! almost looks like a starwars droid or something. are you going to do a single headlight in the center or the projector beams/led offset or something?

Iíve got three of these was thinking offset but Iím not sure

One thing that was really important to me was the flow of the bike, a lot of the time I see builds and they look like the head light tank seat weíre all slapped together but donít tie in together.

This is why I baked my noodle for so long with the seat it was paramount that it tied into the tank.

Iím still not 100% on this fairing, I really like the old school headlight no fairing set up, but I was thinking it would be windy AF at highway speeds over long distances.

I really want this bike to be my cruiser for long rides, the R1 is shitloads of fun but on a long ride gets real uncomfortable, and Iím not getting any younger.

This is why I put the 2.5Ē  risers on, and have the rear sets nearly in a stock position. Function and form, just a pain that theyíre so hard to marry up into something that is aesthetically pleasing.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Feb 28, 2018, 02:53:25
So I wasnít happy with the fibreglass attempt and decided to give the perspex a crack again

I cut a piece and made sure it was all square then placed it upon the tank using the the fibreglass fairing to help press it down as I heated it with the heat gun

Looks a lot neater

Still donít know if Iím feeling it, I fly out to work soon so Iíll have 6 weeks to mul it over


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Feb 28, 2018, 10:19:54
There is something about it that is just not right, but I cant put my finger on it.  Maybe it needs to be wider, or get wider up top...just not sure, but I like where its going.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Feb 28, 2018, 10:39:42
I can't stop wondering if the using the tank ridge for the fairing is overkill.  I love it on the seat cowl, but maybe a flat - or slightly convex - fairing up front would look good. 

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Feb 28, 2018, 12:34:51
Great work. I like the tank ridge but for me the fairing is too rectangular, or maybe I just like things to be curvaceous. Good luck I am sure you will get there in the end, just like the seat, which is fab.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on Feb 28, 2018, 12:47:30
maybe if the sides curved in closer to the fork tubes.. wider and closer
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 01, 2018, 03:59:19
I can't stop wondering if the using the tank ridge for the fairing is overkill.  I love it on the seat cowl, but maybe a flat - or slightly convex - fairing up front would look good.

Iím starting to think youíre right about the ridge




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 01, 2018, 19:10:35
I had the old headlight from the original Frankenhonda, so I just thought I would try it out.

Although the diameter is probably a little too small the headlight seems to look a lot better than any fairing Iíve come up with this far

Iíve attached a photo of a cardboard template I was trying to make up, but nothing I do seems to sit right with me.

I hate to give up on something, as usually Iím quiet persistent when I have my mind set on something, but everything I seem to make or even when I search on line I just canít find fairing that suits it in my eyes.

But when I see her with a headlight it seems better
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on Mar 01, 2018, 19:19:34
I like the look with the old headlight, maybe a mini fairing on top to deflect the air up? It would hide the instruments too. I love the gold rims  8) Not so sure about those throttle cables
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Mar 01, 2018, 23:24:33
Yeah, a little fly screen above the headlight but curved or tapered sides might work.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 02, 2018, 01:30:53
Well Iíve got myself a sweet light but Iím still need an old school bucket to house it, I think it will be just a little too sleek without it




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 02, 2018, 04:02:53
What she would look like as is


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Mar 02, 2018, 07:41:14
my vote is for bucket and flyscreen.

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: djmaynard on Mar 02, 2018, 08:43:15
Love that light and I love the custom faring but curious and always been a fan of a simple fly screen
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Mar 02, 2018, 10:40:03
Hell yes to that light.  Does it have a halo ring around it?  Or integrated indicators?  I'd love something like that for my CB750 one day, would you mind sharing where you got it, or what brand it is?

Edited - Doh, clue was in the photo  :-X

Is that the 7" light you got there?

And yes on the bucket!

Or set it into your rectangular fairing?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 02, 2018, 17:22:56
Hell yes to that light.  Does it have a halo ring around it?  Or integrated indicators?  I'd love something like that for my CB750 one day, would you mind sharing where you got it, or what brand it is?

Edited - Doh, clue was in the photo  :-X

Is that the 7" light you got there?

And yes on the bucket!

Or set it into your rectangular fairing?

It was actually the 5 3/4Ē I was going to get the 7 ď but after seeing that and speaking to Jimmy at Kustom Kommune I decided 7Ē would be too big for what I wanted.

There is no Halo, and what looks too be inter grated indicators is actually two little directional driving lights that shine down on the road directly in front of the bike.

I have handlebar indicators, still to be installed.

The brand is purpose built moto, Kustom Kommune stock it also, and their stuff is really high quality but far cheaper than say moto gadget ( the range is a little small but I dare say it will increase. I actually saw their handlebar switched just after we had made ours and they are really cool, maybe on the next build) was

Unsure bucket or fairing leaning towards bucket of I may powder coat the outside ring of this light as it comes off, potentially gold like the rims or I may even see if I can sand it back to silver


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Mar 02, 2018, 18:42:30
Sweet, looking forward to seeing what you decide to do with it mate
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 03, 2018, 04:41:33
Just ordered these brackets, unfortunately they will arrive while Iím at work.

Oh well it will probably be a final day of cleaning the shed up and packing it all away for another 6 weeks

Progress is slow with fifo


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 04, 2018, 03:34:52
So with a whole help of sanding and polishing, I managed to make a good thing better (in my eyes )

I started by sanding the backing section of the headlight mounting ring to see how it would come up silver

Then I gave it a polish came up alright so I continued with the front section

Once it was all done I did a little mock up with some pink string which I thought looked rather sporty


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on Mar 04, 2018, 05:21:53
Looks much better, but I don't know that the pink string is on trend Ö

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 04, 2018, 17:31:24
Looks much better, but I don't know that the pink string is on trend Ö

Crazy

Pink string is making a big come back Iím sure of it, a lot of quality bike builders are realising the true potential and versatility of pink string... wonít be long now and youíll be seeing it used on all of the BOM winners bikes


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Mar 15, 2018, 11:55:31
Dude where you at?  You decide on what to do with the headlight/fairing?
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Mar 18, 2018, 06:53:18
Dude where you at?  You decide on what to do with the headlight/fairing?

Man I had to fly out to work stuck in the mountains for another month.

Iím thinking headlight and nothing more, but I have just gone and ordered myself a Wiesco 823cc piston kit from Dynoman got some air filters for the CR 29 while I was there, so the should be waiting for me when I get home.

Iíll have to remove the cylinder head get it bored and honed, should probably replace the valve stem seals while itís all out also

A friend of mine here has done the same to his and recommended a guy in boronia to do the work to the head should be a few hundred.

May as well go all out now.

Has anyone else done this upgrade Iím interested to hear how much it changed the performance of the bike.



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Title: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 02, 2018, 05:30:50
So the 823 cc wiseco big bore kit arrived in the mail


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 24, 2018, 02:54:53
So I thought Iíd try to install the Morimoto led handlebar lights.

While I love the moto gadget gear I wasnít prepared to sell my kidney just yet to purchase it.

So my plan was to drill out the plastic stopper in the bar end and insert a rubber Gromit then run the electrical wire through the bar end.

Unfortunately what I didnít count on was the fact the plastic stopper was about half an inch thick

So I had to run with plan B, which was to install the electrical wires without the rubber.

I cut some string and ran it through the hole with the intention of using it to pull through the electrical wire. Being a little slow, I forgot to tie the other end off. So as I tied one end to the electrical wire i pulled the other end of the string back through the handle bar end.

That was the first time, as I attempted to pull the first one through the electrical wire slipped out of the string so I repeated the process until it was successfully through.

Then once I attempted to do the same with the right hand handlebar I realised the rubber tubing that was provided to wedge the handle bar end in was a larger external diameter , I searched the garage only to find one that was too small.

After a quick trip to the auto shop the guys they gave me some hose on the house I was pretty stoked. Then I finally completed the instal

I hooked up some power to see how she looks came up alright


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 24, 2018, 06:36:27
So next on the list was to bend the original R6 gear linkage to marry up with the gear selector.

(http://)

I got out the MAPP gas and gently heated the aluminium before bending an angle into it

(http://)

After two bends she was ready to fit

FYI it doesnít take very much to get the aluminium hot enough to bend


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Apr 24, 2018, 07:46:57
The constant gotcha moments of custom building :) Nice work on the turn signal install!

Rearsets and linkage look really good. Does heating aluminum enough to bend affect it strength wise? Not that pushing the gear position up and down is a lot of force, just curious.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 24, 2018, 07:56:27
The constant gotcha moments of custom building :) Nice work on the turn signal install!

Rearsets and linkage look really good. Does heating aluminum enough to bend affect it strength wise? Not that pushing the gear position up and down is a lot of force, just curious.


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I donít think overheating it is particularly good as it can result in cracking, aluminium doesnít change colour like steel. I would say I heated it for a minute maybe two before bending it.

Like you said the force to change the gears is very low.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 25, 2018, 07:32:58
So today made a few more runs in the shed with my old man.

I removed the front end and brought it with me along with the tank, seat cowl and right handlebar

First job the old man turned up a bracket for the brake reservoir

The next job I tackled was fabricating the bracket for the front mud guard.

First I bent out the flat bar that would run along the inside of the mud guard. Who would of thought bashing out the flat bar would be so challenging, probably would have helped having the right tools. But a builder must Magyver when necessary so a piece of railway iron did the job.

Realising that I was going to need to bend the metal rod. I made a jig using some box tube and some 10 mm rod in hindsight I should have put in 3 pieces of rod.

It took a while to get the rods bent into the correct shape once done we tacked it on to the flat bar, then dad turned up some round mounts to weld on the ends so we could run bolts through.

Once done we drilled through the bracket and mudguard and put one pop rivet through, then I had to head home to put it back in the bike just to make sure the guard was straight. Tomorrow Iíll finish off the rivets. Iím thinking  once itís done Iíll spray it all mat black


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 25, 2018, 18:20:15
My brother made up some prototypes for my stickers.

Still need to make up and fit the blue stripes before making the proper decals, probably take about two weeks before itís all ready

Looks like the respray will happen next break, should give me plenty of time to strip and prep the tank.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on Apr 25, 2018, 22:45:57
Nice!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: trek97 on Apr 25, 2018, 23:10:55
Real Nice!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 26, 2018, 03:23:29
So today I decided to strip the the tank back in preparation of a few minor patch up jobs then Iíll put it in undercoat


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 26, 2018, 03:26:23
Hopefully once she has had a lick of paint and the decals are back on she really pops looks a little drab and grey at the moment.



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 28, 2018, 05:27:43
Ok so I managed to spend the afternoon with my most excellent brother who had some test decals ready

He had to cut them out by hand as this time he didnít have them pre cut luckily his hands are far steadier than mine

Next we placed the tank and seat cowl on a bench and started to apply the decals

We stretched the media a little during the application (mental note for next time ) but overall it came out pretty sweet

Because he was unsure for size the rear stripes were a little too fat, so he reprinted just in paper so we could get the sizing correct for later

The side stickers were originally too big so we resized them with paper, came out sweet

Then I went home to mock it all up, canít wait to get her painted up now really pumped, bro produced the absolute goods






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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Maritime on Apr 28, 2018, 09:08:56
Thats going to look great!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Apr 28, 2018, 09:19:24
Hell yes it is


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on Apr 28, 2018, 09:22:43
Question - did u mock up two different size wing and Frankenhonda emblems for the tank sides? Which one are u going for? I know which one I like!

And I really like the seat cowl shot without the frankenhonda badge too. Looks really clean like that. You guys are smashing it.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 28, 2018, 18:50:29
Yea there were two different sizes, because the brief I gave to my brother was while I was overseas and he didnít have access to the tank. We went with the smaller Frankenhonda emblem, as the other one was just way way too big but we put it on for shits and giggles.

Still undecided with the logo on the back of the cowl we were going to actually put a slight curve to it so it tied into the curve of the cowl more but we will see how it looks once all the decals are made up.

Luckily my bro will make a heap of extras just encase anything doesnít work first time.

The other thing I need to decide is these decals are actually designed so the can be put on top of the paint work with no need for a clear coat over the top.

I know from factory they put clear over the decals. So I need to research the medium and perhaps do a test run with some clear on it to see if it impacts on the quality of the decal.

It would be a lot easier if we spray the whole lot then decals last otherwise itís a day to lay down the white wait a few hour lay down the pearl wait a few hrs decals then final coat clear maybe two coats


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: LightsOut on Apr 28, 2018, 19:01:18
Hell yeah, thatís gonna look awesome! Really like the re-interpretation of the colored lines and the frankenhonda is a really nice touch :) I havenít painted over decals myself, but I do believe you want to cover them in several layers of clear to ensure no edges are showing. Donít skimp on the finishing now ;)


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on Apr 29, 2018, 02:09:39
Hell yeah, thatís gonna look awesome! Really like the re-interpretation of the colored lines and the frankenhonda is a really nice touch :) I havenít painted over decals myself, but I do believe you want to cover them in several layers of clear to ensure no edges are showing. Donít skimp on the finishing now ;)


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Itís really funny because the original plan was to have the bike all black with gold rims (very similar to the cognito moto build)

But then after I chucked the rims on to do a mock up, I loved the white with blue tri colour stripes as it all just tied in.

The decals are on a medium that is ultra thin and made to be placed directly onto vehicles. After we did the mock up there was no more edge than with the original decals which were actually under a coat of clear, unfortunately there is always a slight edge when you use the decals :/



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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: teazer on May 01, 2018, 00:54:50
The combination of stripes and that long long side badge, makes the tank look longer than stock. It also draws the eye to the decals and away from the seat-tank connection and that's also good.   Nice touch.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 01, 2018, 00:56:56
Yea I actually think we could mount the side badge a little lower on the tank to be honest


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 02, 2018, 04:07:47
So did a little more work in the garage.

First thing I did was grind back a few welds on the bracket for the front mud guard, hit it with a wire brush then I sprayed it up.

Next thing I did was strip the paint from the underside of the fuel tank, I used some spray on paint remover, in hindsight I should have used that for the top of the tank. Itís a lot easier to use and did a much better job.

Once the paint had been stripped I gave it a quick blast with the gernie. Once it was cleaned up I could see the rust in the underside of the tank.

I hit the rust with a wire brush on the drill and after a little bit it came up pretty good.

After that I treated the whole tank again with rust converter for about 20 mins then wiped it down with a damp rag followed by some wax and grease remover.

It actually came up pretty good there are only really two small dents I will need fill in later.

Next I hung the tank so I could spray it with etch primer.

The etch primer came out of the can poorly so it was a bit of a shit job once it dries Iíll give it a light sand with some 800 grit before using some filler on it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Pete12 on May 02, 2018, 04:59:48
Awesome job on the bike, it looks great, particularly the seat/tank combination.
I think that there is an issue with putting filler on top of the etch primer though, you might want to check on that before you go any further.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 02, 2018, 05:34:03
Copy that, so it looks like ill have to sand those two sections back tomorrow and bog it up before i go any further.

Tomorrow ill bog it up, sand it back, then prime it up again. I'll also mount the mud guard to the bracket I painted today then install it to see how it looks. Originally I had intended to paint the mudguard a satin black but now I'm not so sure see how it looks on the bike guess if i paint it and don't like it I can always strip it back, I'm getting pretty good at stripping paint these days.

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 03, 2018, 04:25:02
Runs were slow today sanded it back and bogged it up.

Put some primer back over to see how my job was looks like Iíll have to try and build it up some more again tomorrow

I sanded the tail section back and primed it up also

I fitted the front mud guard mount after painting it black came up alright. I still need to drill out the remainder of the rivet holes and the hole that holds the brake line bracket in place

Iíll get stuck back into it again tomorrow.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Pete12 on May 03, 2018, 06:08:51
Front mudguard mounts look great - no easy way on USD forks but you've accomplished it.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 03, 2018, 06:11:40
Front mudguard mounts look great - no easy way on USD forks but you've accomplished it.
Cheers Pete and thanks for the advice about the filler too, tomorrow Iíll drill it out and rivet the guard to the bracket it thinking mat black


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jpmobius on May 03, 2018, 11:45:27
[/IMG]
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Very nice project!  I'm afraid you will need to do a bit more work on your shift linkage though.  The driving and driven links need to be much closer to being parallel to each other.  (Red lines in pic)  They do not have to be exactly parallel, but much closer than you have them.  You can't adjust the driving link without cutting and welding or changing the pedal location, so you have to work around that.  Ideally, the angle between the driving and driven crank arms and the connecting link would be 90o, but there is also a bit of  leeway here and this likely will be ok.  I realize that you have a very nice 90o angle between your crank arms and connecting link, but the 90o needs to be between the crank arms and a straight line between them. This is the theoretical or imaginary dark green line in my pic.  Often as you know, this straight link is not possible to fit, but for design purposes, you must think about the link as if it were straight.  No matter what the shape of the link (light green line), the function (discounting strength/flexibility issues born from the shape) is as if the link were straight.  If you draw a straight line for the link on your existing setup (I didn't make a line for this), you will see that when you push down on the pedal, you won't be rotating the driven link very much.  Easy fix though.  Just rotate the driven crank to match the driving, and create a new connecting link.  Making the bend in it as small as you can (orange line) will make it flex less.  And once you are driving the bike, you will find making very small changes to the angles of the components can make a big difference in the shifting quality.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 03, 2018, 21:25:54
Very nice project!  I'm afraid you will need to do a bit more work on your shift linkage though.  The driving and driven links need to be much closer to being parallel to each other.  (Red lines in pic)  They do not have to be exactly parallel, but much closer than you have them.  You can't adjust the driving link without cutting and welding or changing the pedal location, so you have to work around that.  Ideally, the angle between the driving and driven crank arms and the connecting link would be 90o, but there is also a bit of  leeway here and this likely will be ok.  I realize that you have a very nice 90o angle between your crank arms and connecting link, but the 90o needs to be between the crank arms and a straight line between them. This is the theoretical or imaginary dark green line in my pic.  Often as you know, this straight link is not possible to fit, but for design purposes, you must think about the link as if it were straight.  No matter what the shape of the link (light green line), the function (discounting strength/flexibility issues born from the shape) is as if the link were straight.  If you draw a straight line for the link on your existing setup (I didn't make a line for this), you will see that when you push down on the pedal, you won't be rotating the driven link very much.  Easy fix though.  Just rotate the driven crank to match the driving, and create a new connecting link.  Making the bend in it as small as you can (orange line) will make it flex less.  And once you are driving the bike, you will find making very small changes to the angles of the components can make a big difference in the shifting quality.

Yea the gear linkage was a tricky set up for a few reasons

First was how much backward travel I had when pushing the lever upwards before I would hit the rear side of the chain guarding.

The next issue was that when you would push the lever down wards causing the linkage to travel forwards the linkage hits on the foot peg housing, this in turn acts as a fulcrum causing the linkage to go up.

There is a very small sweet spot in which the linkage will; A not hit the housing causing it to go up, and B still actually change the gears both up and down.

How you see it in the photos is actually in that sweet spot.

Although I am yet to ride it (for obvious reasons) I will have to wait to see if it impacts on riding comfort. Iím. It particularly concerned about the linkage breaking due to it being under excessive force, give there is so little pressure required to select gears.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jpmobius on May 03, 2018, 22:39:33
Yes sir.  Having built dozen(s) of these things I am well acquainted with the frustration of getting them to work properly.  I build most things like this from scratch, and while you have to make a lot more parts, you do have a lot more freedom to have anything you want.  I had presumed that you have the pedal where you want it.  Don't underestimate how important this is - down the road it will be a constant irritation if it isn't in the right place and likely you will have to make alternative parts to fix it.  Really, on my own bikes, I sit on it for quite a while (1/2 hour +) to make sure I have the pegs, seat and bars where they will all work and be comfortable.  (make sure you have beers close to hand!)  On customer bikes, I get them to pretend to ride similarly, and change things around until the bike fits the rider.  (this torture I provide at no extra charge!).  Back to the point, if you are in fact happy with the pedal situation as shown in your original pic, it looks like it will be just fine.  The driven crank that is on the shift shaft is what needs to be rotated like in the pic below.  You will find this to be critical.  Then you only need to alter or create new a new connecting link as shown in green.  The upward angle from the pedal crank arm should provide more clearance when pressing the pedal down.  Also, with bent/curved links with heim joints (spherical bearing, rose joint) on both ends, there is another problem with the link flopping around and potentially rubbing on nearby hardware.  The solution usually is to use a clevis on one end.  A clevis will rotate only in one plane, which will keep the link from flopping around.  Your existing link looks very nice, with it paralleling the mounting bracket, but you can still have this look with an extra bend on the link (light green).
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 03, 2018, 22:55:29
Yes sir.  Having built dozen(s) of these things I am well acquainted with the frustration of getting them to work properly.  I build most things like this from scratch, and while you have to make a lot more parts, you do have a lot more freedom to have anything you want.  I had presumed that you have the pedal where you want it.  Don't underestimate how important this is - down the road it will be a constant irritation if it isn't in the right place and likely you will have to make alternative parts to fix it.  Really, on my own bikes, I sit on it for quite a while (1/2 hour +) to make sure I have the pegs, seat and bars where they will all work and be comfortable.  (make sure you have beers close to hand!)  On customer bikes, I get them to pretend to ride (this torture I provide at no extra charge!).  Back to the point, if you are in fact happy with the pedal situation as shown in your original pic, it looks like it will be just fine.  The driven crank that is on the shift shaft is what needs to be rotated like in the pic below.  Then you only need to alter or create new a new connecting link as shown in green.  The upward angle from the pedal crank arm should provide more clearance when pressing the pedal down.  Also, with bent/curved links with heim joints (spherical bearings) on both ends, there is another problem with the link flopping around and potentially rubbing on nearby hardware.  The solution usually is to use a clevis on one end.  A clevis will rotate only in one plane, which will keep the link from flopping around.

Iím hearing what youíre saying about the Clevis I think I may have one lying around in the shed.

In hind sight we probably could have fabricated up the rear set assembly, but it was a lot easier to get these ones. Worst comes to worst Iíll head down to the old mans place and we can make a linkage to suit on the lathe.

Or I could make a guide to keep the linkage straight and mount it off this bolt.

Iím currently going over the seat cowl with a light in the shed and a grey led just marking out all the slight imperfections. Most of them are so small Iíve been able to hit them with some primer filler.

I think for the rest of the day Iíll be sitting in the drive way with the hose running and the 1200 a 2000 wet dry sand paper.

Still not 100% happy with the tank either so it will need to be sanded back and have a little more filler put in where I sanded the back too far yesterday. Luckily the tank will be predominantly white as opposed to black which is a very unforgiving colour.

Iím going to quickly head to the hardware and pick up some mat black paint and knock this mud guard over, hopefully if I time it right I can go from tank to seat to guard as they are drying


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 04, 2018, 08:13:00
So I managed to etch prime and get the first coat of Flat black on the front mud guard.

Then I sanded back my original filler job to have another crack at it

And after all that I put some primer on and itís still not right.

I was hoping to spray it at my old mans tomorrow but that ainít going to happen, I have to get these small imperfections out or they will look at me every time I hop onto the bike.

Back at it tomorrow I didnít realise how long the enamel paint took to cure. Iíll probably get another coat on tomorrow then rivet it to the brackets tomorrow.

Need to at least finish something before I fly out to work.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 04, 2018, 09:58:38
Nothing but respect man - I'm a bit of a perfectionist too and while it never gets perfect I can always say I gave it my best.  You're going all out mate, and it's inspiring to watch.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 04, 2018, 18:44:18
Nothing but respect man - I'm a bit of a perfectionist too and while it never gets perfect I can always say I gave it my best.  You're going all out mate, and it's inspiring to watch.

Thanks Jimbo, while I know it will be worth it, itís frustrating at times, knowing that soon I wonít be able to work on it for another 6 weeks .

Iím debating whether or not to take the engine apart and get the cylinders and heads done while Iím at work.

Iíve been quoted 4 - 500 to have the cylinders bored out, and about the same to have the heads cleaned up, new valve stem seals put in and the valve lapped. Then when I get home I can get stuck straight into putting the big bore kit in and getting the motor back together.

although there is still work to do on the frame, steering damper mount lol decisions, decisions... but first I better get this tank and seat in order. Jnr decided he would give me an early wake up call today, so it must be a sign to get stuck into it


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 04, 2018, 18:56:54
Going big bore man, what would that push the cc up to?  Thing's gonna be faster than a fart in a fan factory...
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 04, 2018, 19:28:25
Going big bore man, what would that push the cc up to?  Thing's gonna be faster than a fart in a fan factory...

Itís goes up to a 823 cc, Iím hoping that l, the CB 900f cams, CR 29ís, CB 600 F2 coils and Delvic 4 into 1 will do the trick.

Although Iíve been told by a guy that use to build these to race that with the cams they use to have one of them from a cb 1100 or 1000, not sure if itís an inlet of exhaust.

Ok see how I go with the 900s first, still such a long way off, all I want to do is get it done so I can go with a bust with the guys from Melbourne Cafe Racers. Plus I want to hear how it sounds with all the mods


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 04, 2018, 19:40:44
Plus I want to hear how it sounds with all the mods
I bet!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 05, 2018, 06:39:05
So the wifey did a trade with me while I looked after jnr she made a start on the upholstery for the seat

Itís been a little challenging we used about 3 layers of thin foam with another think layer of high density to put up under the top piece of leather to get that rippled effect.

Then she sewed the side strip on unfortunately the first time she confused the front with the back of the seat and put the seam at the wrong end (insert angry wife face emoji) so after I brought this up and then agreed that I would unpick it she got back to it.

So far itís coming out alright, we will have to use Velcro to hold the leather on to the seat pan as I believe if I try to staple into the fibreglass it will break it. So we will glue the Velcro to the finer glass and stick it to the leather, then use that to pull it tight then Iíll use another strip of Velcro between the seat cowl and seat pan and upholstery to hold it to the bike.

Maybe tomorrow we may get it done, but jnr can make wifey availability a little unpredictable. Hes not quite ready to do the panel work with dad yet.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 7aliveatlast7 on May 05, 2018, 15:59:34
I usually use rivets on the underside of my seat pans to hold the seat covers on. I just go around the perimeter of the pan and drill an 1/8Ē hole every inch, inch and half. I use small washers on the rivets to help keep the vinyl, leather, or whatever youíre using from ripping.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 05, 2018, 19:01:29
I didnít even think about that, shattered because the Velcro I got cost nearly $50 .

I donít think I will achieve much today have some friends popping in for lunch, see how it goes.

Yesterday when I went to put the second coat of black onto the front mud guard I knocked it over totally ruined the paint I had to strip it right back and start again (Iím pretty sure I swore when that happened). Such is life resprayed it and Iíll have to put the second coat on again today, fingers crossed 🤞 I donít do a repeat performance.

I managed to get the seat cowl all sanded back and primed up so thatís where I need it to be, and the tank I sanded back and filled in again but this time I let it cure over night.

I will also be using a solid piece of wood for my sanding block instead of a cork one, I think it may have been flexing and thatís why I was able to sand the filler lower that the surrounding panel work.

Thatís my theory anyway and I hope itís correct. If I can get the tank squared away and primed up, I may have an opportunity on Wednesday to spray it up. Iíll be pretty stoked if I have that done along with the mud guard and seat upholstery.

Then Iíll look at trying to fabricate up an electrical tray and getting the motor out, so I can send the cylinder and heads away to get some love.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: jpmobius on May 05, 2018, 20:13:44
Looks like you will end up with a cool seat.  On my own seats, I use contact cement to glue the cover to the base.  The perimeter really needs to be a single thickness of material  with a minimum of seams to get a good bond though, so I tend to have pretty simple upholstery.  I spend a fair bit of time getting the foam the way I want it and contact cement that to the base.  Before I install the cover, I stretch some car headliner over the so far completed seat and glue it on just like I plan to do the cover.  This is super cheap and REALLY helps the end result.  If it looks good at this point, it will look good with the cover.  Rivits are good, I sometimes use them on trouble spots that the glue doesn't want to hold, but they can be aggravating to get right sometimes.  I tend too use some pretty stretchy vinyl most times because it makes easier - leather is much more difficult - but patience and perseverance will get the job done.

Looks like a good portion of your dents are on outside corners, which can indeed be a bit taxing.  A stiff flexible sanding block is likely good, but avoid shaping the actual corner until after you have the top/sides cut level with the adjacent flatter areas.  Then carefully shape the corner radii.  The trouble I see most people having results from using too fine a grit of sandpaper to do the bodywork.  If your parts were in my shop, #80 grit would be the finest paper to touch them until I was shooting primer.  Get the shape right with course paper, and stay focused on the shape and don't be concerned with how smooth it is.  Once you are happy with the shape, shoot some high build primer.  I try to get inexperienced people to use a guide coat right away, as it will teach faster than any lesson. In case you don't know, A guide coat is simply a super thin layer of paint you will sand completely off.  There are official commercial products, but I just grab an old spray bomb of black quick dry lacquer and dust the whole thing from 3 feet away or so.  It can be super thin - barely even visible.  It will be very obvious when you start sanding.  Block sand with #220 wet.  You can use a slightly flexible block, but do use a block until you really know what you are doing (I always do) or you will put finger marks in the surface from the uneven pressure of just using your fingers.  You will see low areas, scratches and pin holes will stay black until you sand deep enough to remove them.  If you hit metal or epoxy (I recommend always starting with with epoxy to encapsulate the steel or fiberglass base of the part you are painting, but it is common not to do this) and still have visible guide coat, you will have to have another go at filling the surface at those areas.  So sand the whole part with #220, fill what you miss, re-prime, re-guide coat, and re-sand.  Repeat as many times as required until you can sand the entire part and have no guide coat remaining, and no cut through spots into the steel base (or whatever material the part is constructed from.  Another coat of primer, another guide coat, and now #400 sanding again (always) with a block.
If you now have all the guide coat removed, and have not cut through, you are ready for paint.  And your bodywork will be absolutely, positively, flawless.  Now you just have to get the paint to match!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 06, 2018, 01:34:59
Looks like you will end up with a cool seat.  On my own seats, I use contact cement to glue the cover to the base.  The perimeter really needs to be a single thickness of material  with a minimum of seams to get a good bond though, so I tend to have pretty simple upholstery.  I spend a fair bit of time getting the foam the way I want it and contact cement that to the base.  Before I install the cover, I stretch some car headliner over the so far completed seat and glue it on just like I plan to do the cover.  This is super cheap and REALLY helps the end result.  If it looks good at this point, it will look good with the cover.  Rivits are good, I sometimes use them on trouble spots that the glue doesn't want to hold, but they can be aggravating to get right sometimes.  I tend too use some pretty stretchy vinyl most times because it makes easier - leather is much more difficult - but patience and perseverance will get the job done.

Looks like a good portion of your dents are on outside corners, which can indeed be a bit taxing.  A stiff flexible sanding block is likely good, but avoid shaping the actual corner until after you have the top/sides cut level with the adjacent flatter areas.  Then carefully shape the corner radii.  The trouble I see most people having results from using too fine a grit of sandpaper to do the bodywork.  If your parts were in my shop, #80 grit would be the finest paper to touch them until I was shooting primer.  Get the shape right with course paper, and stay focused on the shape and don't be concerned with how smooth it is.  Once you are happy with the shape, shoot some high build primer.  I try to get inexperienced people to use a guide coat right away, as it will teach faster than any lesson. In case you don't know, A guide coat is simply a super thin layer of paint you will sand completely off.  There are official commercial products, but I just grab an old spray bomb of black quick dry lacquer and dust the whole thing from 3 feet away or so.  It can be super thin - barely even visible.  It will be very obvious when you start sanding.  Block sand with #220 wet.  You can use a slightly flexible block, but do use a block until you really know what you are doing (I always do) or you will put finger marks in the surface from the uneven pressure of just using your fingers.  You will see low areas, scratches and pin holes will stay black until you sand deep enough to remove them.  If you hit metal or epoxy (I recommend always starting with with epoxy to encapsulate the steel or fiberglass base of the part you are painting, but it is common not to do this) and still have visible guide coat, you will have to have another go at filling the surface at those areas.  So sand the whole part with #220, fill what you miss, re-prime, re-guide coat, and re-sand.  Repeat as many times as required until you can sand the entire part and have no guide coat remaining, and no cut through spots into the steel base (or whatever material the part is constructed from.  Another coat of primer, another guide coat, and now #400 sanding again (always) with a block.
If you now have all the guide coat removed, and have not cut through, you are ready for paint.  And your bodywork will be absolutely, positively, flawless.  Now you just have to get the paint to match!

You are 100% with the guide coat, although I donít call it that I never really know how good, or bad a job Iíve done till I respray over it once there is a solid colour over the panel the blemishes become obvious.

Itís going to take a few goes yet with the tank, Iíve nailed it with the seat (as long as the paint goes on well) but the tank and itís angles are quiet a challenge and will require a little perseverance yet.

Iím fairly stubborn/ persistent once Iím set on something, that said it doesnít get me to the end result any quicker.

My guests for lunch have just left so I reckon I might hit another coat of black onto the mud guard. Then go and put some of your advice to good use on the tank.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 06, 2018, 23:11:33
So the paint is touch dry on the mud guard. So I thought I would put it on the bracket to see how she looks.

I still need to drill out the hole for the brake line bracket and the other two rivet holes.

I donít mind it black I needed to comply to the law relating to guarding but at the same time I really like the no mud guard look (however impractical it may be on a wet day). I guess by having it black you kind of get the best of both worlds.

Last night I put some spray filler on the tank because where the filler was looked a little porous, so I hoped the spray filler would fill in these small imperfections.

This morning Iíve just been out with the wet dry  and then hit it with some etch primer again

Once itís dry Iíll take a few photos so we can inspect my handy work.




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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 07, 2018, 00:30:24
Mate that fender is genius. 
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 07, 2018, 02:12:09
So turns out when we went out the upholstery on, it was too small 🤬we tried to pull it but it was just getting ridiculous and after going so far with everything else. Weíve now gone to mark II

I then took a few photos of the tank, you may not be able to see it in the photos, but itís round 3 now sanded it back.

Iíve just washed it off and wiped it down now. Iíll probably need to put some filler into the one dent thatís got me miffed itís on top of the rear left curve going down to the back of the tank.

Itís a straight dent that runs east west on the tank, seems every time I sand it back I somehow sand the filler too low, even when Iím using a solid wooden block to sand with I keep going too low.

Although each time Iím doing it, the depression is less and less, so I guess thatís a sign to just keep chipping away at it.

Iím really not that good at panel beating / spraying / fiberglassing ... I have nothing but the upmost respect for people that are masterful in these disciplines.





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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 07, 2018, 03:58:16
So while I think Iíve nailed the angle here, I noticed a small dent that I failed to see earlier :/

Right on the edge and a curve Murphyís law.

The back ends of the tank seem to have come up alright.

The etch primer is doing something weird it nearly looks like itís wrinkled here, I know when I sanded it it was smooth.

Iím unsure what would be causing it? Perhaps moisture ? I usually wipe it dry, the wipe it down with wax grease remover then let it sit before I spray.

The last two photos are of the dent I just canít seem to nail with the filler.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 07, 2018, 07:31:08
So the wifey had some more progress with the mark II upholstery,

Sheís put some Velcro along the sides but is yet to put some in the ends, we will still have to use rivet in some places.

I just threw the leather over the seat to give us an idea of the direction it was heading, and itís going where we want it to.

Tomorrow I think we will get the Velcro sewed on to the leather then Iíll glue the other half to the seat pan and hopefully she comes up looking mean. I think Iíll need to spray some contact adhesive to the foam in the seat pan and the foam on the underside of the leather before laying it down 🤞 it comes out sweet.

Tomorrow Iíll finally finish this front mudguard by putting in the rivets and mounting the brake line bracket.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 07, 2018, 10:39:15
Dude you owe your wife a posh dinner - that seat came out great
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Pete12 on May 07, 2018, 12:18:05
Dude you owe your wife a posh dinner - that seat came out great

+1 on that, it looks awesome. Upholstery is the only part I farm out on my bikes, sure wish I (or my wife) knew how to do it.

If you've got your tank dents very close you might just want to try some high-build primer on them. Much easier to sand than filler and with it all being the same material it's very easy to shape it correctly. I would, however, be a little concerned about the etch primer behaving that way, something not right there. They don't look like humidity blisters though...

Edit: sorry, half asleep last night. Etch primer should be just a light coat sprayed over the whole surface, you need to use normal primer from here on in.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on May 07, 2018, 14:55:06
The seat and your wife's upholstery look fantastic together.

I wonder if with your east-west dent if you use a block which is longer than the sand paper so the the block can reach the far side of the dent before the paper starts to cut that this might stop you from making the filler too low.  I'm not the best bodyman so I could be off here, just an idea.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 01:35:35
+1 on that, it looks awesome. Upholstery is the only part I farm out on my bikes, sure wish I (or my wife) knew how to do it.

If you've got your tank dents very close you might just want to try some high-build primer on them. Much easier to sand than filler and with it all being the same material it's very easy to shape it correctly. I would, however, be a little concerned about the etch primer behaving that way, something not right there. They don't look like humidity blisters though...

Edit: sorry, half asleep last night. Etch primer should be just a light coat sprayed over the whole surface, you need to use normal primer from here on in.

I hit it with some light sanding, cleaned the area, prepped it with wax and grease remover let it sit. Then I hit it with the etch primer then it came up good, go figure.

I masked up the two other areas of concern, including my east west dent and then hit it with coat after coat of spray filler.

But spraying has had to take a break burgers with the wifey and vaccinations for jnr, just in a waiting room now.. poor little bugger is in ignorant bliss unaware of whatís about to occurs.. Iím thinking tears


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Pete12 on May 08, 2018, 08:22:48
Yep, I'm thinking tears too.

Just a question, why did you mask the repair areas? You'll have a big ridge that you'll need to sand off flat afterwards. Not a problem at all, just more work for you.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 08:23:23
Well my mask and spray filler attempt was poor at best. I think there was not enough time left in between coats, this caused it to laminate.

Bit of a catastrophe resulting in me having to take it all the way back and in the process Iím pretty sure I took even more off the east west dent. I then used normal filler to build it up and pretty much got back to the place I started from kid of like catching a bus on a round about and getting off where you got on.

I even used a long block hoping it would be touching both high sides of the tank so as not to sand the filler too low, but somehow I managed to do it.

The little dent Iíve managed to save so thatís one less thing to deal with. Tomorrow Iíll wake early and try to spray the filler a little at a time see how I go with the notorious east west dent.

I used some spray adhesive to stick the Velcro to the underside of the seat pan, but Iíll have to wait until tomorrow to try it with the upholstery on.

See how it all goes tomorrow hopefully she all comes together in the morning otherwise Iíll have to call off spraying it until next break


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 08:25:57
Yep, I'm thinking tears too.

Just a question, why did you mask the repair areas? You'll have a big ridge that you'll need to sand off flat afterwards. Not a problem at all, just more work for you.
In hindsight, I probably should have just sprayed without it why is it that these things are so clear in hindsight?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Maritime on May 08, 2018, 08:56:45
you can drill the corners of the velcro and rivet them down to help hold it in place and prevent it peeling up over time.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Pete12 on May 08, 2018, 10:14:31
In hindsight, I probably should have just sprayed without it why is it that these things are so clear in hindsight?


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Haha, everything is clear in hindsight.
You should put your spray putty over the primer, and in very light coats with plenty of drying time in between. I think you're better off with primer/filler, or high build primer, if you can get some tomorrow, and lay that on once your dents are close.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Maritime on May 08, 2018, 10:34:09
I usually get it close with bondo/filler, then use a little spot putty/glazing compound if there are pinholes etc, then sand that out then finish with high build filler primer and can usually get it spot on. That is when it's for someone else, when it's for myself I give up at "that's good enough" LOL.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 18:19:09
I usually get it close with bondo/filler, then use a little spot putty/glazing compound if there are pinholes etc, then sand that out then finish with high build filler primer and can usually get it spot on. That is when it's for someone else, when it's for myself I give up at "that's good enough" LOL.

Iím starting to get fairly close to thatís good enough


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 19:15:16
you can drill the corners of the velcro and rivet them down to help hold it in place and prevent it peeling up over time.

I think Iíll run with that rivet idea, as it will definitely come up over time


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 08, 2018, 20:56:23
Well I riveted along the Velcro, then put the leather on and had to cut and rivet the corners that the Velcro wouldnít get.

I started using washers but ran out, itís not pretty.

Iíve just placed it on the seat cowl for the photos so itís not secured on yet. We probably wonít be taking out any upholstery awards but Iím pretty dam happy with the wifeys handy work. Sheís an absolute superstar.

I can guarantee that it would have not at all looked like that had I attempted to do it.

So itís back to the dreaded east west dent all the others are sorted.

I think I will pack up all my stuff and head over to the old mans and try to repair it there, if I have a win and the weather is good we can spray if not back home I go and the job will be on hold until I return from work.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 1fasgsxr on May 08, 2018, 21:09:53
Heck yeah man that looks killer
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: PDub on May 08, 2018, 21:30:17
I love your work and perseverance!

I'm no means an expert, but I have successfully done some rattle can painting. I think etch primer goes on bare metal to chemically etch it for adhesion.  I think it's an acid that creates the etch and I don't know how this would work in layers. I think it's etch primer to the metal and then regular primer after that.

For body work, I don't rely on my eyes but on my hands.  When I get close, I close my eyes and try to "feel" the dent.  If I can't feel it, I stop sanding immediately regardless of what it looks like.  I repaired several dents in a car fender like this and then painted it dark red.  You couldn't see any remnants of the repair.

Again, love your work and progress.  It's going to look great when you're done!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: The Jimbonaut on May 08, 2018, 22:06:58
Great work fella, and wife-of-fella too
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Markie-V on May 09, 2018, 00:46:05
Your seat looks absolutely killer I love the lines that look sewn into it. I'll have to look more closely at your thread, but I'm interested in knowing how you got that affect it's absolutely beautiful. I'd like to do the same thing on the project I'm working on. I'd love to get that effect. Again .... that's beautiful! Great job.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 09, 2018, 00:51:07
Your seat looks absolutely killer I love the lines that look sewn into it. I'll have to look more closely at your thread, but I'm interested in knowing how you got that affect it's absolutely beautiful. I'd like to do the same thing on the project I'm working on. I'd love to get that effect. Again .... that's beautiful! Great job.

Thanks Markie, do you mean the rippled effect/ humps in the leather ?


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 09, 2018, 06:41:27
So this is what the east west dent looked like,

So after I put some dianese leather treatment cream onto the upholstery I packed up ship and headed to the old mans.

I had a funny feeling things were not going to come together how I wanted today. I was late away this morning, a major arterial through the city, causing me to take a ďshort cutĒ through the city where there was a protest going on. Making a 45 minute trip into a 2.5 hr trip.

After arriving I once again sanded the tank back then put some filler on, in my eagerness to make up for the hour wasted I began sanding too early. The filler was not yet fully cured making it come off in chunks, so once again I sanded it all back

Then I followed the advice from jpmobius and used a 240 grit paper instead of 600, then PDub I used my finger to feel her out once she felt good I hit it with the primer and boooom

I felt as if I had cracked the Da Vinci code, unfortunately by this time it was late afternoon, the winds had picked up and the grey clouds began to come in so we called off spraying. No point to rush it and stuff t up now.

Iíve left the tank and seat at my old mans and when the weather is right he will have a crack at it.

At least this way it will be fully cured before we go and install the decals my brother made.

Tomorrow will probably be taken up by me cleaning the shed up enough that we can park a car in it again.

Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: stroker crazy on May 09, 2018, 08:08:06
Well done!

Crazy
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: CrabsAndCylinders on May 09, 2018, 15:08:26
The seat looks great and also nice work on that dent!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: PDub on May 09, 2018, 17:58:54
 :D That really looks great!!
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: Popeye SXM on May 09, 2018, 20:33:04
impressive, I admire your perseverance. Looking great, as I am sure you know, a great paint job needs good prep. I like the seat too  8)
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 09, 2018, 20:42:41
impressive, I admire your perseverance. Looking great, as I am sure you know, a great paint job needs good prep. I like the seat too  8)

Thanks Popeye, I too have worked out the hard way, that a paint job is all about the prep. Had I not messed up previous jobs through poor preparation, I probably would have settled for less by now.

Fingers crossed the paint job comes out sweet.

Still on the to do list;
electrical tray
battery box
need to get a rear sprocket ( in not even quiet sure what rear hub I have, 4 bolt pattern)
send the cylinder and heads away
get the exhaust customised a little to tuck it away more.
Make Chain guard
Anodise top triple and switch gear
Brake lines
Powder coat frame

Lol sheís a few breaks away yet.

Right now Iím trying to clean up this abortion of a garage I have here


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: 7aliveatlast7 on May 10, 2018, 23:34:58
Whoa, the seat looks great! Body work can be a brute, way to keep at it.
Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 11, 2018, 02:31:13
Whoa, the seat looks great! Body work can be a brute, way to keep at it.

Thanks mate, sheís definitely been a lesson in perseverance.


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Title: Re: FRANKENHONDA II the 1982 DOHC CB 750F2 Build
Post by: cb250nproject on May 14, 2018, 07:41:11
I was looking through some of the older build photos there is definitely going to have to be some customisation of the exhaust system.

Unfortunately I will have to get someone else to do that.

It looks bad ass, low and staunch. But itís going to be impractical when riding, one of the things I wanted to do with this build was put function before form.

Itís difficulty I find that perfect balance. I want Frankenhonda to be a bike I can ride all day still enjoying it. Not like the R1 where Iím just about crippled after 3 hrs on the highway.




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