Has anyone tryed the stock YZ450 needle in a 07 wr450. How did it work? This is my first attempt at rejetting. A friend has one and told me to try it in the 4th position. Am I wasting effort here? And its free. Altitude-1100 to 2500'. Main jet 168. Pilot jet 48.Leak 45. Oring mod,air box and exhaust mods,grey wire unpluged, ais is removed. Any advise would be appreciated. Also has a Moose Racing fuel screw and YZ throttle stop.