I'm running a powerbomb and Power 4 pipe, FMF says to run a 180mj, needle position 4th from top, stock pj, air screw 2 3/4 turns out. I've run as high as a 178mj with these specs and response sucks. Crack the throttle and it won't pull. Could this be an accelerator pump problem? I know the '00 has an updated carb design from earlier WR's.