I just bought my 2004 10R used and, while it seems to run fine, at idle (and slightly above) there is what I would call a quite loud whine or whirr coming from the front of the engine above and beyond the normal clicks and low pitched running noises. No other bike I've had has sounded like this. Since I don't know anyone else with a ZX10 to compare sounds with, I was wondering if that's normal for this engine or if it's something wrong in the cam/whatever? From my verbal description, does this sound like yours does, or might I pay a visit to my local motorcycle mechanic? Thanks!