We put in a JD jet kit on my buddies 06 WR450f today and now we can't get it to idle right. We put in the red needle with clip in the 4th position, 170 jet, AP mod. Also removed the AIS, new K&N air filter and adjustable fuel screw (2 turns out). The exhaust is already uncorked, the grey wire is cut, the throttle stop shortened. Once we got it started back up, it sounded a little rough but ran good while you stayed on the gas. Whenever you let off the gas, it dies out. Then it is difficult to get back started. We can't seem to figure out why it is not idling at all. Any ideas?