I just started hearing a buzzing vibration sound from around the engine head area when shifting, "letting off gas", and when down shifting at relatively high RPMS. I can also make it happen when I rev it to moderately high RPMs from a parked idle. I stopped by the shop where I bought it today and the mechanic also heard the sound and said I should bring it in for further investigation. Any clues on what may be up with this NEW bike....only 4K miles. Hoping its not serious?? Thanx for any feedback!!!