SOHC.co.uk Forums > CB750

750 F2 chain damage to gearbox

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Laverdaroo:
My thinking also, intrigued to see not only the process but the results you end up with. I’ve had a quick look on the net but the difficulties of your repair really would highlight it’s usefulness and versatility if it proves to be a winner for you.


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paul G:
The issue I had with it is getting enough heat into the material you are repairing.

clinto:
Did some fin repairs on CB350 and found that it required a tremendous ammount of heat,and of course the instant you go above your left with a blob!
Took an assistant with oxcy/acet keeping head hot and holding repair peice in position while I held,another torch and filler rod.
Will never attempt again.

johnm37:
You're right about the amount of heat needed. Aluminium conducts it away too well. I started with a blow lamp but that took ages. Oxy acetylene worked better. The biggest problem was not hitting the rod with the flame. Do that and it turns to paste and won't flow.
I managed a reasonable repair. It's certainly strong. I hope I've sealed all the cracks to stop oil leaks. I welded the big piece back in. Then I put a piece of stainless steel behind the hole to support the weld puddle. That worked well. The Durafix didn't stick to the stainless allowing me to fill quite a large hole.
I've taken pictures but they're over the 3Mb limit for posting. I will try again tomorrow.
Tomorrow it's the turn of the top casting.

royhall:
Be careful you don't get too much in there as the gears behind the repair are very close to the casing.

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