I know this has been posted and asked a million times but here I go again. I need help with jetting my WR450. I have the stock exhaust with baffle removed, airbox mod, throttle stop mod and gray wire cut. For a while I was getting along just fine with the stock jetting but just this weekend it started to run like crap, backfiring and dieing at idle. Between acceleration and deacceleration it runs terrible! Drained the gas and put in new and still the same problem. I understand something about a rejetting kit for the WR's? What kit do I need, and where do I get one?? I'm in Arizona and the desert here is around 500ft above sea level. What do I need to do to get my WR kicking some butt! I need some numbers from you guys. I'd appreciate any feedback.