Look for meal flakes in the oil, large chunks of metal in oil (when you drain). When you drain oil estimate if you had enough in it. When you pull clutch cover look for anything that is obviously broke, or by wiggleing worn, kicker assembly, everything in clutch area. If you find nothing, pull plates out of clutch, chain off, and start rotating shafts and shift it thru gears to see if you detect anything. Did I mention checking chain/rear wheel?
Novel idea, after all this consider going on a CR forum.
Novel idea, after all this consider going on a CR forum.