I have observed a very pronounced and audible vibration / noise around 4000 to 5000 RPM. It seems to be coming from the "fairing" , dashboard area or somewhere up front. It is remarkably similar in frequency to the vibration noise I got on my Suzuki VStrom when I had a Heidenau Scout sort-of-knobbly front tire. It was speed dependent: it started around 95 km/h and was very annoying until 125 km/h, when the wind noise would mask it. When I switched to a more road-oriented Shinko tire the sound went away. Has anyone discovered any new info on this, as the thread was started a couple years ago?