my dad has a 2003 warrior and just got a hotcam stage 1, and he has already had a dmc pipe, moose jets and pro flow filter.Well today we tested the hotcam and we couldent see hardly any difference, so we were thinking what could be wrong and we remembered that when we picked it up the guy said the warrior did not need any jetting done he just put it in, and said go for it. well when we got a pipe for it they messed up the jetting like 3 times before he got it right so we thought that it was probably the jetting that was wrong. So does anyone know what we should do?Is it even jetting?
By the way when it is at a constant high rpm it backfires alot more

 

That backfiring should be your first clue. It shouldnt backfire at all, not on acceleration, constant throttle, or decelleration. You probably had the jetting too lean to begin with if you had backfiring before you installed the cam. Try bumping up your main sizes incrementally until it doesnt do it anymore.