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New Engine Sound - 79 GS1000

  • Thread starter Thread starter Skowinski
  • Start date Start date
S

Skowinski

Guest
I may already be onto the answer, but looking for some confirmation. I have a 1979 GS1000 with about 50-60k miles on the engine. Recently - only noticed when warmed up and only at idle - it has an light irregular rattle that sounds like it's coming from the top end. I'm guessing either the cam chain tensioner isn't working right, or the cam chain is stretched, or maybe both?
 
This is a classic example of "camshaft end float".......Billy
 
Here's the deal, a cam chain adjuster that isn't working the engine will sound like a paint can full of gravel on a paint shaker, it's very noisy. A stretched chain won't make noise, just alters the cam timing a bit, and it won't happen until way past 100,000 miles unless the engine has had a very strange history like racing it with no oil changes ever...

As far as valve guides and seals, how much does it smoke?
 
I will look into the cam end-float issue, thanks.

Smoking is not too bad, but varely visible at times, not at others. It isn't likely to be the cylinders, as I installed a 1085 Wiseco piston kit about 5,000 miles ago. The top end has not been looked at in a very long time though.....
 
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