does anyone notice a vibration sound coming from their bike... im not talking about the feel when its around 6000 rpm, but it sounds like somethings loose. it goes up witht he rpm and speed, i cant feel it but i can hear it... i dont know because i replace the cowlings, and i dont know if i put them in not quite tight, and im not positve, but i dont think i noticed it until i put them on, but it might have been before, i can tell if its the engine or the cowlings... le tme know thanks