I have a 07 WR450 and it bogs off idle when you blip the throttle. It does affect it on tight slow trails. Did all the free mods (AIS removal, gray wire, airbox & exhaust mod) put a 170 main jet, adj fuel/mix screw, and went up to a 48 pilot jet Checked the accelerator pump (spot on) and still have the bog off idle. The leak jet is the only thing I have not changed. Is the leak jet the culprit or is there anything else I'm missing? If it's the leak jet, go to a #40?? Thanks for any input.