So just finished replacing my steering head bearings and while doing some other maintenance specifically oil/filter and rear differential fluid change. Bike is on lift and on center stand. I clamped front wheel and started bike then shifted to first and let bike run to warm up both engine oil and rear differential fluid. I notice (both before and after rear fluid change) a knock or rattle from rear end seems to be loudest near the forward end of the final drive case. If I tip the throttle it seems to disappears. I haven't noticed any issues or noise while driving the bike at all.