Hi, Fairly new to 4 strokes so any help is appreciated. I've recently purchased a 01 yz 426, the problem I have is when I try to rev the engine, it just backfires, pops, and cuts out, at idle the bike is fine, and I have no trouble starting it hot or cold, I have replaced the sub wiring harness and removed the carb and cleaned it. But the problem still exists! Please help!!!