finally I've got the time to take the windshield off and dig in the fairing. I used all the tricks mentioned here (a bit of tape on the joints, an extra rubber washer on the ribbet) and the "bzzzzz" is gone as far as I can tell. Wow, this bike is smoooooth! I wish Kawa had the panel gaps better put together. That'd do justice to such a vibration free engine. Sometimes I can't really decide if it isn't smoother than the in-line 6 from BMW. Nope, I'm not mad. I know what I'm talking about. And the suspension in the Kawasaki, although harder, actually deals better with the little irregularities on the road, and makes the ride smoother.