SOHC.co.uk Forums > CB750

f2 rebuild...help...

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K2-K6:
Yeh Trigger,  I didn't know what to call them either. Guess they are more rings as they're like half a piston ring in large scale.

The bottom cases have the groove as well as during machining it's not possible to bore the groove halfway round because the crankcase are machined bolted up as a pair to ensure accuracy and tolerance is achieved whiteylfc. Easiest route during production is to leave that lower half there but redundant, looks like something should be in there later though.

MrDavo:
The half rings (aka oriental hobbits) stop your gearbox clusters from wandering sideways. As you say you can have more slot than ring, but you shouldn't have none.

I put my crankcases back together using a tube of Harley Bond I had left over, I don't think it was any the wiser.

K2-K6:
"wandering gearbox clusters " seem eye wateringly painful,  you can probably get ointment for that,  or perhaps syrup of figs may help  :D

It's the clutch mech that tries to push that shaft sideways that's the principal reason for the design. You get similar thrust resistance in car cranks to stop the clutch pushing the crank along as well.

There must be a double meaning in "thrust resistance " I'm sure  ;)

whiteylfc:
Cheers boys...thrust resistance!!!sounds like a cheap date gone wrong...looks like I can torque down the conrod bolts and put the lid on this thing..👍

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