My '04 WR450 dies when throttle cranked after idling. It always has and now seems more touchy after installing JD jet kit. I'm running blue needle on 4th position (standard). #170 main jet. Zip-ty screw between 1 3/4 and 2 turns (it was at 2 stock). Bike has all the mods below. Since exhaust and grey wire mods it popped pretty bad on decel. Have not actually ran it with new kit, thought I would diagnose this first. If you let it idle and gun the throttle it dies, or gun the throttle a couple times in a row it dies. Any ideas? Sea level, 60 degrees today.