1999 Yamaha YZF-R6 Logo
Posted on Jun 12, 2009
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Poss loose timing chain- is there an external adjuster?

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Bob G

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  • Posted on Sep 23, 2009
Bob G
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The cam chain tensioner on the R6 is external but it is also automatic. If you are hearing cam chain noise, the tensioner could be getting close to ratcheting up one notch to quiet the chain down. The chain could be stretched enough to make noise but not loose enough to let the tensioner take up the slack yet.
You can loosen the adjuster mounting bolts very slowly until you hear 1, and only 1, click. Then bolt the tensioner back down and start the engine and see if it is noticeably quieter. If it is, leave it alone. If the noise is unchanged, the chain was not loose and the noise is coming from somewhere else.
Thanks
RSRBOB

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Anonymous

  • 1392 Answers
  • Posted on Jun 12, 2009

SOURCE: poss loose timing/cam chain!

Cam chains are self adjusting. They have a tensioner that takes up slack as the guides wear and the chain stretches. You may be able to get away with new guides if your chain isn't too stretched. Look for pieces of plastic in the oil, which will signal work guides. It is possible you are hearing the valves rattle, and it would be time for a valve adjustment.

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