Since I'm new to the rocket riding world, I seem to have a slight problem with chain stretch. My 2000 Busa, with some modifications, seems to need the chain re-tightened....often. There is no abuse, other than an occasional rear wheel ride and thats all throttle, no clutch! Does my size have anything to do with this problem? (6'05", 250lbs) Any suggestions? Or just too much power from engine to tire with the chain being the weak link? (no pun intended)