No Mods, 04, 7300mi - I put it on the center stand, ran it, and held in the clutch to find out where the noise was coming from a few days ago. It sounded like it was in the gearbox, or the back tire (rear wheel bearing) but then i had my friend listen while i stayed on the throttle and he said...
The chain does have slack in it. I am lost as to what could cause the noise. My wife and I bought the bikes last year 06 and 04, hers Red mine Blue both FZ6's. I checked hers and there was no noise like the one mine is making.
I have a whine in my gear box, I think, that whines at speeds above 35mph. The whine goes higher in pitch the faster it rotates. I held the clutch in for a few seconds and the noise is still there.
The sound it makes is about the same as road noise the tires on a car make going over a grated...