I know that the jetting questions have been asked before and I have done a lot of searches, but I guess that I am still confused. Bike bogs when I crack the throttle off of idle and will stall if I dont let up. Where should I start to correct this? How does the jet sizes work, is the bigger number a bigger jet or smaller jet? Thanks for any help. I have an 08 WR 450 grey wire mod exh. mod air box snorkel removed F2 Racing Powerback kit F2 kit includes AIS removal fuel screw needle changed main jet from 162 to a 140. F2 instructions for my altitude 6000 ft. changed leak jet from 60 to a 50. fuel screw 1 turn out. have tried 1.5 turns out also. needle is recommended on 2nd clip. have tried 1st 2nd and 3rd positions.