Took the sprocket cover off mine yesterday, been getting noises and vibes through the footrests that pointed to a possible worn chain and sprockets, plus i was rather paranoid about the sprocket nut loosening problem.
Happy days, the sprocket nut is tight but both the chain and sprockets are due for replacement, boo!
Cleaned all the crap out of the cover and around the sprocket, discarded the cover gasket, which was in bits anyway and re-fitted the cover and made the necessary adjustment to the clutch to compensate for the missing gasket.
My chain cleaning routine has usually been a case of cleaning the chain with WD40, then wiping the excess off with a rag, then using a paintbrush to grease the chain with LM grease, i really don't like the spray type chain lubes, maybe i'm just old fashioned?
Anyway, just about to order the 12mm front sprocket nut and tab washer and a new chain and sprocket kit.
G ; )