SOHC.co.uk Forums > CB500/550

Partially Restored 74 CB550

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davidcumbria:
One of the bushes at the end of the throttle spindle has been damaged. Suspect attempt to drive out shaft before removing axial location pin since that has been sheared. A long shot, can’t find anything about these bushes, has anyone sourced or replaced them ? For clarity  I mean the spindle in the long throttle mechanism across all 4 carbs not the small shaft going into the carb for the piston. Going to replace sheared  pin with a retapped grub screw as seen in another thread.

Oddjob:
Ted had the same problem, bush was broken in half. Might be repairable but it was cheaper to just find another bracket tbh

McCabe-Thiele (Ted):
Yes one of my bearings was similarly damaged, when I drilled out the small pin I found the inner right half of the bearing was missing. I suspect it had been broken for some time looking at the crud that was there.
Surprisingly the shaft seemed pretty well supported with one and a half bearings. Sourced a good one from Ken, as a one off repair it would have been too expensive to have a new part specially made.

I think Florence might still have a spare worth a PM.

Oddjob:
Just remembered I have a nos bracket, mint condition but it’s not cheap. Think CMS want around £350 for one last time I checked.

The bracket is now 877 euros 😧😧

davidcumbria:
Have had all the parts vapour blasted so they look good. Shaft has no significant free play, the  bearing is 80% intact on one side and 100% on the other so it’s not worth replacing the bracket and I’ll just monitor it for now. Not going to be doing massive mileage anyway.

Replacing the axial securing pin with grub screw that can’t nip the shaft leaves it loose in the threads. Do you use loctite or I was thinking of maybe some epoxy to hold it in place ? I wonder if threadlock works when the thread is not pushed tight by coming against a hard stop.

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