FRANKENHONDA II the 1982 DOHC CB 750F2 Build

cb250nproject · Oct 27, 2017

jag767 said:
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 ì'd have been riding it already!

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

At least all the fibreglassing is on and drying, hopefully I’ll get it sanded tomorrow

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

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The Limey · Oct 27, 2017

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.

cb250nproject · Oct 27, 2017

Is this the bit that you mean ?

I too have often thought about it it’s quiet a strange line to deal with I had a mate who had a welder make it straight edge but that’s 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

I’d 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 don’t think either my dad or I could do

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cb250nproject · Oct 27, 2017

Ok so I’ve given it a sand

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

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

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

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

Although I don’t think I have the line spot on yet I definitely think this will be the way I’m going

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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cb250nproject · Oct 28, 2017

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, it’s still not spot on but much closer to where I think it’s going to end up

I’m 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 I’ll do product placement for them hopefully they will cut me a mean discount

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jag767 · Oct 28, 2017

Umm you should 100% have the tank modified to that. Total game changer and you will be glad in the long run.

cb250nproject · Oct 28, 2017

jag767 said:
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 ?

innovativems · Oct 28, 2017

I’d 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 doesn’t match the aggressive lines these bikes had. These bikes lend well to angled aggressive lines.

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jag767 · Oct 28, 2017

cb250nproject said:
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.

innovativems · Oct 28, 2017

This has been the best execution for tying into that tank I’ve seen

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cb250nproject · Oct 28, 2017

innovativems said:
This has been the best execution for tying into that tank I’ve seen

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I’ve seen this bike it was one of a pair they did,

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

Also I’m 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

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.

This is one of the guys from a group I’m 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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teazer · Oct 28, 2017

innovativems said:
This has been the best execution for tying into that tank I’ve 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.

cb250nproject · Oct 28, 2017

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.

stroker crazy · Oct 28, 2017

cb250nproject said:
probably thinks im building a boat with the amount of fiberglass and resin ive purchased.

Ha!

Crazy

cb250nproject · Oct 29, 2017

That moment where you’re doing your nut trying to get the shape right with your contour tool and something just doesn’t 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 it’s better to work that out now, rather than someone point it out to me after it’s been painted

So I’ve made a dam in an attempt to push the edge of the ridge over to where it’s supposed to be

Just waiting for it to dry again.... better call Guinness I’m 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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cb250nproject · Oct 29, 2017

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

It will get there I have faith, I also built up the top of the edge on the back left because the shape didn’t mirror the right

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

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

The underlay was thin so I cut it into squares appropriately the size I wanted for the seat

Then I got my trusty can of spray adhesive, and layer upon layer began to stick them together

I squared it off and ended up with ...

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

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cb250nproject · Oct 30, 2017

So while I wait for another lot of resin to dry #resinking, I decided to play with ideas for the front fairing

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

I’m 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

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cb250nproject · Oct 30, 2017

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

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

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

She’s been a mission I hope it’s worth it

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cb250nproject · Oct 31, 2017

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

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, she’s easy to cut but no so easy to put back, as I have found out again and again during this process

I couldn’t help myself I rigged up the power to see what it would look like.

I’m liking it

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stroker crazy · Oct 31, 2017

cb250nproject said:
… I’m liking it

Looks good!

Crazy

FRANKENHONDA II the 1982 DOHC CB 750F2 Build

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