Topic: first gear lash - cb550

[ben.cb500]

Recently rebuilt a cb550. Did not know its condition when I got it. I have had the cses apart, nothing jumped out as worn, actually everthing showed no wear at all (8k miles on odometer).

Have put about 200 miles on the new motor and have notice a wierd lash in first gear once the clutch is let out. Nothing major but noticable. I did not replace the clutch and am wondering if its just a clutch issue or something else.

Its hard to describe, but once you let the clutch out from a standstill, there be a light thud and lash like slack is being taken up....Anyone familiar with this?

Thanks
Ben

[Gordon]

How's the tension on your drive chain?

[ben.cb500]

Drive chain tension is ok. Relatively new chain and sprockets.

Or do you mean the hy-vo primary chain?

Noticed issue is more pronounced once fully warmed up.

[dave500]

these aint like newer bikes,,sometimes you have to live with how they are,they do have more lash than new bikes,be sure as gordon posted your chain is adjusted correctly,theyll all be fifty years old shortly!

[ben.cb500]

Thanks guys. Not too bothered. Just like to learn what may be going on ..... thanks

[NShahdadi]

I have the same issue with my '76 550. It's annoying, but I think I've gotten used to it at this point. I used to think I wasn't getting the perfect combination of throttle and clutch release and that it was operator error, but it seems to do it no matter how smoothly I transition. Kind of glad to know I'm not the only one experiencing it.

I too recently replaced my chain and sprockets and have tightened the chain slack since breaking it in. Still "lash"-ing a bit, though. It's almost like something catches and it jumps forward every so slightly, for me, at least. Mine doesn't happen immediately from a standstill but closer to around 3000-4000 RPMs, once the clutch lever has been fully released.

[scottly]

Thanks guys. Not too bothered. Just like to learn what may be going on ..... thanks

You might want to check the cush drive on the back wheel?

[chewbacca5000]

Thanks guys. Not too bothered. Just like to learn what may be going on ..... thanks

You might want to check the cush drive on the back wheel?

How do you check the cush drive anyway?  Is there some sort of test you do.  I l'd like to know I think mine may be worn on my 750.

[uksparky]

I have the same problem in first gear..never thought of the crush rubbers in the rear wheel..that makes sense....i will check
Thanks

[scottly]

I have the same problem in first gear..never thought of the crush rubbers in the rear wheel..that makes sense....i will check
Thanks

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Sorry for the thread-jack....

[uksparky]

Just checked my rear sprocket/hub levering on the sprocket nuts..sprocket hub is moving all over the place...where can i get the wheel damper rubbers..