I'm comparing mine and my buddies Hayabusas here... Mine (2003 GSX1300R) - You can hear the gears spinning in neutral, pull the clutch in and they stop spinning (of course). It's not loud but if you listen for it while at a light, you can hear it when you're on top of it. Moving off from the light it sounds like what you would expect from straight cut gears, it whines a little, doesn't sound unhealthy but it's very much there and easy for people off the bike to hear it. Shifts though gears great. Buddies (2005 GSX1300R) - No noise at neutral, no real noise while pulling away, shifts a little harder/clunkier. Did they add some noise cancelling jazz a little later on, or is this not right?