have you adjusted the chain to the correct tightness when you put the wheel back on as it could just be your chain hitting your subframe cause its to slack just a thoughtHad alook at bike cant see a thing wrong with it? the problem started after i tuck the back wheel off to clean swingarm. Ive put all the spacers and that back right way because i checked on asaniard picture. The noise only happens after a good hour or 2 riding. could it be a gearbox fault?