I have something going on with my "07 109 with only 210 miles on it, hopefully someone else have experienced the same thing. I hear and feel it around 2900 to 3300 RPM's in top gear mostly, what it sounds and feels like is there is a clunk in the bike and you are hitting bumps. What I think it is a cough or backfire in the intake. Does anyone have or has had this problem or do they all do it???