By the way, how can i stop the muffler from rubbing the two halves with each other? I always have a dirty wing. I tried tightening it but it only made it worse. I didn't know that two metals rubbing together can do that. My instructor mentioned something about a thread locker. What is that? By the way, some good laughs and good advice in this post. Ill try to tune the engine my self when i get the chance to.