if i give my bike full throttle it spitts and sputters, i'm guessing there is too much gas, and not enough air, but i dont understand why my motor would just be like that when my buddy's engine runs fine and everything is the same between them. can anyone help, also my clutch slips and i have the flower nut on the the disk as tight as i can get it, i feeel like buying a new engine and just starting over.