Question about 1981 Yamaha XJ 650

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Rattle in top end

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?????

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  • yp_steve_coc May 25, 2009

    it doesn't effect the bikes power, if you let of the throttle a little you can make the noise go away or quiet down and if you give it throttle you can hear it also.

  • yp_steve_coc May 25, 2009

    thanks for your help on my 650 special!

    What would be the symptoms of a weak valve spring besides a rattle noise?

    I adjusted the valves when i rebuilt the head gasket and there is only a slight valve tick, i would rather have them a little lose than too tight, my noise is a louder metalic noise.
    Thanks for your help!

  • Rotticus May 11, 2010

    does it affect the bikes power? it could just be that chain, my chain has more play than I liked but it was supposed to be rite, my shadow had a lot of noise similar to what you described, I had several different mechs and a dealer all come up with the chain, but my thoughts were on the bearings any( and I mean any) play and at high rpm's & the top end would vibrate due to the balance variable

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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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