i'm working on my buddies 2000 shee, it has pro circut pipes, lightened flywheel, bored .20 over, k&n air filter, ported, 300 main jets.. it starts 2-3 kicks everytime, but once i get into the powerband and get through some of the gears it falls on it's face and runs like shit. the right cly kinda crackles and it kinda sounds like it's sucking air to me, but i can hold the throttle wide open and the thing barely moves. :: i need help