FRANKENHONDA II the 1982 DOHC CB 750F2 Build

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So I’ve been doing my nut how I’m 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

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Then I masked it up and made the cave man mould

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

See how it turns out in the morning


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Looks really neat with the tail light! I say embrace the tank angle, I like the fact that it doesn’t flow perfectly and it’s part of what makes it stand out as an F. What you’re working on now looks promising!


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This is where it’s 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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In between coats update

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So i prepared all my fibreglass matting and cloth

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

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

Once this lot cures I’ll see how much the left side needs to be built up then hopefully it’s about sanding and shaping although I’m 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 I’ll have to undo all my hard work






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

I’m fast running out of time before fly out day :/ unfortunately these things can’t be rushed


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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

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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

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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

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I think I’ve got it now

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Then I sanded in the sides more to match the tank

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The I rounded off the top of the seat pan that marries up to the back of the tank

I’ve tried a few times to replicate the angle I had before on the left hand side an I just can’t seem to nail it, so it’s time for me to pull stumps for the day and come back to it again tomorrow I don’t want to fuck it up because I’m tired, it takes too long to fix

Tomorrow I’ll 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

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Just a few shots of the bike in full


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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
 
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

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I went to the recycle bin and found an ice cream tub lid

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I squared it off and put on a centre line (hopefully it’s better than the one I used on the the seat)

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Then I drilled out a hole the same diameter as the rear shock mount
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Then I drilled out a small hole for my pencils to go through ... boom cave man compass

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I hit it with the dremel and it finally came out as close to exact as I think I’m going to get

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Next I marked up the underside of the seat pan and where I was going to trim the side fairing to

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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

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I’m digging it

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It’s all down to this last cut and I just can’t seem to get it spot on, so I’ve come in for some lunch.

I’m 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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You're effort with this is quite impressive, and I think the end result will be as well. ;D
 
jag767 said:
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 it’s 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 I’m going to make up a DIY for making a seat out of fibreglass, a summary of all the things I’ve learnt and how to avoid all the mistakes I made (of which I’ve made many)

I’m 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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clem said:
Ever thought to make a plug and mold to get it right? Probably would have been way less hassle.

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I couldn’t purchase the right kind of foam to shape, even at Clarke rubber which is the go to for foam products here

That’s why I ended up using thin cardboard which was less than ideal

But I wouldn’t have had nearly as much fun doing it that way, plus I was worried with the economy being the way it is if I didn’t keep purchasing resin and fibreglass that the companies may go under without my support


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cb250nproject said:
I couldn’t purchase the right kind of foam to shape, even at Clarke rubber which is the go to for foam products here

That’s why I ended up using thin cardboard which was less than ideal

But I wouldn’t have had nearly as much fun doing it that way, plus I was worried with the economy being the way it is if I didn’t 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.
 
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