I, too am having the same problems as those others listed. The bike ran 2 years ago, but would foul the plug on left side unless I carefully pulled the spark plug wire about one quarter inch from the plug. Old 2 srtoke trick. Now I cant even get the motor to keep running. It backfires and spits out the carb. I think carb is dirty and float level might be wrong, but dont have a manual to know the float level specification. Does anyone know what it is?