Countershaft Sprocket Clunk Noise

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Feb 12, 2015 | 01:21 PM

#11

neonarc

Thread Starter

Senior Member

1st Gear Member

Joined: Oct 2013

Posts: 179

From: Mexico

Quote:

Originally Posted by GBAUTO

Doesn't look horrible from what I can see. If the teeth show any signs of hooking or if the valleys where the rollers contact are getting oblong rather round then it's time for replacement. Try pulling the chain away from the back of the rear sprocket-if it moves more than 50% of the depth of the tooth then the chain also needs to be replaced.

Tried the pull test, could only get just barely get a 1/4 of a tooth to show. The front looks just a tad hooked I think. I think I will replace it soon, but at least it's not an emergency issue. Thanks,

Feb 12, 2015 | 01:25 PM

#12

neonarc

Thread Starter

Senior Member

1st Gear Member

Joined: Oct 2013

Posts: 179

From: Mexico

Quote:

Originally Posted by marcham

On the 1st picture it looks like the top cog about to engage the chain is missing. Is this a 15 cog with the original chain length and rear sprocket?

Yeah it does jaja, but there all there, 14 of them anyway as came stock. At least that's what I understand from the service manual and this page.

JT Sprockets: Catalogue

Thanks,

Feb 12, 2015 | 09:01 PM

#13

klx678

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Joined: Aug 2009

Posts: 4,650

From: Delaware, Ohio

1st Gear Member

That front sprocket is JUNK! Dump it. Per my thinking it also looks like the rear has a fair amount of wear. It isn't easy to see with a picture though. It just looks like the U profile is worn out of symmetry. The rear will always hook at a slower rate due to having the chain supported by more teeth than the front, distributing the load and thus the wear is lower.

I think someone put a new chain on old sprockets based on the "pull test" for chain wear. Keep running those sprockets and you will ruin the chain due to the irregular loading on the chain due to the worn sprockets. That was what the PO of my bike did. I commented about the worn sprockets and he didn't think they were. I replaced them immediately. He also put on a really cheap non-O-ring chain, which I would not have done and didn't do. I did new sprockets and a new DID O-ring chain.

Last edited by klx678; Feb 12, 2015 at 09:07 PM.