the motor I just put on my bike seems to overheat or at least I think that's the problem I don't know anymore than the basics of 2 stroke motors. Anyway after 15 mins the throttle becomes unusable (dose nothing and maintains slow engine power) and I need to pedal really fast to get it going a good speed. also the muffler starts making a loud popping noise. The problem goes away after a break of 10 mins or so. Idk if The air filter being removed would be a factor in this, I took it off cause it wouldent fit. My bike frame is too small. I am gonna make another air filter when I get a chance. I know the oil mix is not the problem because it's mixed 18 to 1. Anyone know what the problem could be? Thanks