So what causes the handlebars to wobble once a bike reaches 40 mph? If it matters, I have an 01 intruder 1500. I just bought the bike from a man who laid it down 4 years ago and never fixed it. Well, I've repaired everything. I never noticed it with my hands on the bars but the other day I removed them while slowing down and the front wheel and bars started to shake violently. Scared the $#!* out of me.