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Cam chain noise...

  • Thread starter Thread starter 80GS1000
  • Start date Start date
8

80GS1000

Guest
Getting a dragging noise from the top end of the motor from what sounds like the cam chain dragging on the plastic cam chain guides. It gets louder with higher RPMs. The top end was rebuilt about 3000 miles ago but the cam chain wasn't replaced at that time.

Should I:

a) try to take out any slack in the chain using the installed APE manual cam chain tensioner
b) replace the cam chain - probably due at this point? Is it possible to replace the chain without splitting the cases? Seems like you should be able to remove the tension from the chain, break the old chain, then attach the old chain to the new one using a master link, then turn the motor by hand to thread the new chain around the crankshaft camchain sprocket, then reset the timing and tension down the new cam chain.
 
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Doesn't your engine have a top gear that the chain runs on? I've seen those wear out on KZs.
You can try an APE tensioner but to replace the chain I'd split the cases and install a HD chain.
 
Take the top off and see why it's making noise. I bet one or more of the plastic chain guides is worn out or broken.
 
Salty Dan's old 1000G's cam chain was still in spec for elongation after 80,000 miles. Most likely the chain is fine but you need to snug down the tensioner a smig.
 
chef1366 said:
Doesn't your engine have a top gear that the chain runs on? I've seen those wear out on KZs.
You can try an APE tensioner but to replace the chain I'd split the cases and install a HD chain.
Click to expand...

There's no jockey sprocket on the 1000.
Cases don't need to be split to change the cam chain. You thread the new chain through using the old one. The new chain comes with a rivet link, identical to the other links in the chain, that needs to be peened over when you install it.
I'd check the tensioner first, though.
 
Are you sure the current tensioner is working and set correctly? :-k

Too many times, the tensioner rod has been locked into place when it was installed. The set screw should be turned out about half a turn to allow the rod to slide by. The set screw is then locked into that position with the lock nut.

.
 
One more for agreement on tightening down the APE tensioner you have, and seeing if that helps. I'd get my hands on a mechanics stethoscope if you don't have one already. Terribly handy tool for tracking down the odd noise here and there. Plus, it's really neat to listen to the different areas of your engine while it's running. Kinda gives you an aural picture of how everything interacts with everything else.
 
tkent02 said:
Take the top off and see why it's making noise. I bet one or more of the plastic chain guides is worn out or broken.
Click to expand...

Seconded. In particular, I've seen a few of the little triangular ones at the back that are cracked badly (I think they're prone to overtightening or more probably using bolts which are too long - only a guess but I can't think of another reason why they cracked like the did).
 
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