symptoms are after the bike has been under load i am getting a nasty top end rattle/judder have checked the clutch basket and springs there is slight wear in the springs but nothing major the basket itself is in good nick also the plates?? the oil pump drive chain is pretty loose could this be the problem?? the engine is running very lumpy and rattly as revs rise ??
Answers:
no offense but you have a machine capable of 170+mph i would take it to the mechanic just to be safe
Loose oil pump drive chain may make the noise, but why is it loose? Check all of your mounting bolts while you're at it.
Could be the engine. Sometimes they are prone to these little niggles.
it is time to adjust your valves
Coils, or HT leads?? Under load, they may be breaking down.
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