Now i am by now means an expert nor could i even imagine driving a 200+ hp busa, and i'm sure someones gonna come and call me a dumbas but did suzuki change the clutch in 2002 or 2003 because i just added a new clutch ring to my bike and it shifts great. and its easier to up shift also and it doenst have that clanking noise. Now from what i hear the stock clutch is good to 400 hp so just thrwing the two washers and clutch plate in should help out a little. Best of all the mod was only 37 buks and took bout 2 hrs. So you may want to try that. Remeber im no pro so it could be something else. But if Suzuki didnt change out the clutch til 03 and you want to try it let me know and i can give you the part numbers of the stuff you need and a little walkthrough...if not than i just took a whole lot of time to say nothing at all.