I tightened my chain a while back and I believe I'm right in spec with what the manual says it should be. After I did, I can hear a little whine along with the engine noise. I only hear it under power...release the throttle and it goes away. I think the bike made that noise from mile 1, but I never paid it much attention. I also have a Suzuki, and all I hear from it is engine noise, no chain, gear noise. Can anyone else hear the gears, tranny, and chain of their Kawasaki. BTW, mine is an '06 ZX-6R.