for a few years now i been having a tapping sound from my right head,it only happens between 2000- 2500 rpm s but only when the engine gets hot like rideing it a few miles but at first start it wont.you can than hear it when bike is on k stand, but the kicker is that is does it 80 percent of the time but i sometimes get the other 20 when its not doing is at all.i checked the spark plugs on that side and there were great.anyone have any problem like mine,i´m thinking it maybe a sofe spot in cylinder or mess it kinda of also sounds like a valve spinning,well ty . Tbonenf911.......