Doubt Yamaha would do anything about the noise, saying it won't affect reliability. That's the canned manufacturer response to such issues these days, and it may be true, but by the time you know for sure you're long past warranty. Seeing as though the degree of noise can be different from machine to machine, I see this as a parts quality control problem. If you happen to get a clutch assembled with parts closer to exact tolerances you get a quiet machine. If you get a clutch assembled with parts on the minus side of part size tolerances you get a noisy machine. Replacing clutch parts may or may not help depending on the parts they send you. Guess if happen to get a quiet one consider yourself lucky, if yours is noisy like mine just have to grin and bear it. If you're looking at buying a Yamaha wheeler, you might want to take it for a spin before handing over the check.