It started starting hard slowly. I ride it hard most of the time for 1 to 2 hours every weekend. I would say close to 3 to 4 hours a week. As I said before it slowly started to do this, before I had to crank it over 3 or 4 times then a few weeks later choke it and now I have to take the air tube off. I think its the shims. There is no power loss that I can tell, this thing rips when its not spinning.