smoke

I've run almost 5 tanks of gas and it's well broken in and been running great. I was about 15 mles into a trip going around 30mph and the bike lost power (full throttle got me 20 mph). I tried to shut it off but nothing happened so i braked to a stop which cut the motor off. It then smoked (from...

My motor is smoking from the header i thought it was a bad gasket but i replaced it but it still did it. The motor is a skyhawk 66/80cc jet, its not broken in yet but i never had this problem with any of my other motors. At low rpm it'll jerk the chain like its stalling but i checked the idle...