sounds like fireing to me you may just have a plug goning dead or you cdi may be goning out but i had a 2002 mess up like thta once and it was the stock kill stuitch set up it was grounding it self some how ??? but it would only let me rev like 2,500 rpm to test this take the kill stwitch off and start it that how i found the on on customers but first thing i do to new banshee is cut tors wires and take rubber out of stock clutch system hope this will help you later andrew wv banshee