Question about 1981 Yamaha XJ 650
There is a rattle in the top end at highway speeds seems to vary with engine load, few years ago i put a new head gasket and replaced the cam chain guide, thought that would take care of it but it was still there and has always been there, any ideas?????
Have you adjusted the valve lash lately?
With engine COLD....
Valve Clearance Intake: 0.11 - 0.15mm ( = 0.004 - 0.006")
Valve Clearance Exhaust: 0.16 - 0.20mm (= 0.006 - 0.008")
29mm shim kits with a wide range of sizes are available from aftermarket dealers. (motion pro shim tool works great)
Also a weak valve spring will cause the valve to "float" and make a rattle noise...as well as excessive camshaft end play.
Make sure your valve train is getting proper lubrication.
Good luck....i hope this helps
Posted on May 25, 2009
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Posted on Jan 02, 2017
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