Another $300 '81 CB750c build

Bluegoat, Curious about the fit of the f tank, how serious of a modification is required? Is it just a matter of the length and adjusting the cross member the tank bolts to?

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Check out J-Rod's 750 he has a pretty similar blue http://www.dotheton.com/forum/index.php?topic=64649.0
 
CB MIKE said:
Bluegoat, Curious about the fit of the f tank, how serious of a modification is required? Is it just a matter of the length and adjusting the cross member the tank bolts to?

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The tunnel is a little narrower, it hits the weld for the gusset at the front but it will get past if you work the tank side to side to walk it past. I also shaved a little off the rubber mounts. The rear mount moves 3"-4". The petcock swapped in from the C tank to the 80 or 81 900F tank and it's in the right place. My key also works for the tank.

Got started on the seat and tail. Glued and carved some blue foam. Hope to get some drywall mud on this weekend.
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Glad to hear it. I'm picking up an 81 750f I found on Craigslist for $100, going to use what I can for my build. Buying it mainly for the tank but I'll use anything else I need too. Yours is looking good by the way.
 
BlueGoat said:
Got started on the seat and tail. Glued and carved some blue foam. Hope to get some drywall mud on this weekend.

Wait, what? You finishing the garage walls too? I've not heard of this method of seat making before. Interested to see how well whatever you are doing works out. It took me two tries to get my seat even on both sides so be sure to measure 1000 times before you start to lay fiberglass (assuming you aren't building a seat out of drywall)


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JSJamboree said:
Wait, what? You finishing the garage walls too? I've not heard of this method of seat making before. Interested to see how well whatever you are doing works out. It took me two tries to get my seat even on both sides so be sure to measure 1000 times before you start to lay fiberglass (assuming you aren't building a seat out of drywall)


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I was wondering the same, keep the mud dry once done. That stuff will melt away if you decide to ride in the rain haha.

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.02 on the tail: C shocks are low and soft. You might want to look into giving yourself more clearance. You can fit F/K shocks, but even with that extra inch, it still might not be enough if you put a loop where you have your foam.
 
The blue foam and mud are easier to shape and reshape than other methods. Once the shape is right it can be painted and waxed. The paint and mud keep the resin from eating the foam and give a nice finish to the mold. Making a mold is not really necessary but fiberglass is cheap and who knows, I might be able to sell a couple.

Thanks for the heads up on the shocks. I've been looking at the rebuilt China shocks (RFY) for the rear & progressive springs or emulators up front. Looks like both can be tuned for weights.

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BlueGoat said:
Thanks for the heads up on the shocks. I've been looking at the rebuilt China shocks (RFY)

I'm sure I won't be the only one to say this, but you might want to look for other options. I bought a pair just to check them out and have decided to make desk lamps out of them instead. The upper mount is too small and barely fits, the lower has to be shimmed to make sure the aluminum doesn't crack, and the bolt holes are too small and there is not enough material to safely drill out and retap in my opinion.

And I'm not even mentioning that they aren't filled with enough nitrogen or oil from the factory.

There is a guy somewhere around that will rebuild them for $75 or so, but then you are out $150 and could have gotten a nice set of Hagon's for $200 properly setup for your bike.
 
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