was riding my bike this morning to work. after about three miles the mph went lower and lower. suddenly i was only able to go about 10mph until it finally the engine just quit on me. not sure whats going on. when i start peddling and release the clutch there is a popping noise like a small backfire from the igsaust pipe. ive never had this problem before so i dont know where to start to get it up and running again. where should i start and what would cause this kind of problem? thanks guys
