Burned, I have a 2001 wrf 426 that I can not get to run from 0 to quarter throttle(pilot circuit). It has Stock timing, jd blue 3rd clip, 155 mj, AP pump shortened timing, 42 pj, msr mixture screw(similar to zip ty) YZF pipe. Mixture screw at 1.75 turns out. As soon as I take it above 1/4 throttle it pulls like a 14 year old schoolboy, but when ran at a steady 1/8 to 1/4 throttle it misses and surges. have tried 40 and 45 pj but were both worse. Any help would be greatly appreciated.