Ok here it is! I have a 2000 busa and installed a 2002 motor. I know the 2000 had an analog fly wheel and the 2002 has digital. I put the analog magnito or flywheel on the bike and the motor runs great when giving a little throttle. but at idle it sounds like the chain tensioner is loose. I removed the motor from the 2002 and it ran just fine. does anyone have any ideas??????