SOHC.co.uk Forums > CB750

750 F2 chain damage to gearbox

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McCabe-Thiele (Ted):
DK do a reasonably priced delivery service with a fair returns policy - worth speaking to them I would have thought as you have dealt with them before.

JamesH:
What’s the engine number on the cases you’re trying to replace?

johnm37:
Engine No. B750GE-1004112
I've had some good luck on this, I hope. Since TIG welding doesn't work, I decided to try some of these wonder rods that weld aluminium at low temperature. My local stockist (who I tend to trust to sell quality stuff) sells Durafix. Not cheap but worth a try. So far all I've done is tin the part that's broken off. The rods worked really well even at my first attempt. Having put a pool of Durafix on the metal, I ground it back with a power file. It's harder than the aluminium and certainly adhered well. Tomorrow I will try welding the pieces back together and let you know how it goes. Fingers crossed.
There's various video's of Durafix on Youtube.
Also, I have no connection with the company.

John

royhall:
That sounds interesting. Take some pictures along the way so we can see the process. Best of luck with it. The cases for sale at cb-four are in the correct number range for your engine should the weld not turn out well.

Sent from my Pixel 7 Pro using Tapatalk

Matt_Harrington:
John, I also would be interested to see how the Durafix rods work. I have some ally to try and repair and was thinking of this approach. It may also work to replace a fin on a cylinder barrel I have (maybe)

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