I've got an 08 YZ450, stock besides an Lexx pipe. I bought it used and its never ran exactly right. Basicly it runs very poorly in lower rpms, it will occationally completely cut out at mid throttle. It runs great at high rpms just really rough low to mid. So I tore the carb apart and here is what I found, Main Jet 160, Pilot Jet 45, Leak Jet 72 and another jet that is 38 Im not sure what that ones called. I live and ride between 6k and 10k feet above sea level. I can't find anything at this high of an altitude in the jetting database. Im not sure where to start, any opinions would be helpful. Thanks in advance!