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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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