i have been riding this bike to and from work for the past few months and it was running great. well this morning about a mile into my commute it just started to loose power and when i came to a stop it wouldnt idle and just died. it started back up and has no low end power but a good top speed, the exhaust sounds like it has a extra note (dont know how else to explain it?) i was thinking a compression related problem? any ideas are welcome.....