SOHC.co.uk Forums > CB500/550

500 4th gear AWOL

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Tomb:
Anyone got any info/ideas please.

Riding to work a few weeks ago I lost 4th gear, I've been too busy to look at the bike but thought I'd ask before making plans to delve into the box. I'm just coming to the end of another rebuild with parts everywhere so didn't have time or space to do the Honda and have been using it for the work run by short-shifting through 4th.

It appears to go into gear, so the selector mechanism seems to work, but doesn't drive, I get rattling like its trying to engage if I try to drive through 4th and when this rattling happens I get a pulsing on the clutch lever mimmicking the noise, as if the dogs are worn and its trying to work but pushing the clutch shaft slightly. Is this a known fault like 2nd gear on early Yamahahahas, or is it just old age and use showing up. I have a 550 donor bike that may donate its engine to keep me OTR for now.

Any ideas from you experts would be welcome.





BTW, the rebuild I'm busy with included fixing the 2nd gear on the Yamahaha ::)

LesterPiglet:
Dogs are probably broken off. Time for a strip. You could probably see the damaged component by removing the sump.

Bryanj:
There is no one gear over any other that breaks but all can if abused in the past, i have seen dogs sheared off before now.

Gears and selectors are getting more and more difficult to find and 550 ones don't fit (maybe SOME gears before i get jumped on!! but a lot dont)

LesterPiglet:
I have the 3rd from a 500 in my 550.  Just to clarify.  Sorry Bryanj.   :P

Tomb:
Thanks Lester and Brian. My brother has a 500 bottom end lurking about somewhere, I'll try and scrounge it for the gears.

I was hoping to plonk the 550 engine I have in whole.

Many thanks

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