Hi all i have a totaly standard mc21, and i've just started to notice a strange noise coming from behind clutch cover, i've drained oil and it was nice and clean no filings, it seem to be worse when choke was on than when the choke is turned off, i had to listen for the noise allot harder, seems to be more on tick over if revs picked up the noise seems to go away, i know a noise is virtually impossible to sort without hearing it, it doesn't go away when clutch pulled, any idea's is there a bearing thats prone to go or a bush, im assuming its not a bush because of the lack of filings in gearbox oil, its got 5k on the clock i think the milage maybe genuine as it has the original chain and fairings are unmarked and engine sounds sweet apart from this noise, i've owned it 2years and had no noise when i got it.