| Strange rattling sounds.
Help!!
When I have been taking the bike out the last few times, I have noticed a strange metallic rattle from somewhere on bike, bit like a loose bolt,with it's washer vibrating.
It starts around 2000rpm fades out soon after , then re-appears at 4000rpm, only to fade out just over that point.
I have been right through bike, checked anything and everything that moves, and it is still there.
Stopped off at W M Snell's in alton, mechcanic went for a blast, he also herd it , but could not pin point what was the source.
He did'nt think it was a shim issue, since you dont get it when stationary, and rev up.
Did an oil & filter change soon after, found a few very small bits of metal on drain plug, and nothing else.
Bike seems to run fine, no lack of performance, or is there something more sinister going on in side engine.
any input greatly appreciated. | 
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