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2007 yz 250f off idle bog

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:banghead:Can anybody help me please? I just bought this bike used, and it has a full fmf megabomb w 4.1 titanium silencer. T:banghead::banghead:he bike seems to run great after I roll the throttle slowly, but it has a bad bog just off idle if i whick the throttle quickly. It will actually stall the engine from a standing idle sometimes. Quite frankly it is a bit dangerous. I have read a bunch about changing the leak jet to a #40, but i wanted to see if anyone else has the same setup and found that it was something completly different.

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I've had the same problem, its better now, although not completely gone.

O-ring mod on the Accelerator Pump

40 Leak jet

Make sure you have a good squirt out of the accelerator pump. Also time to squirt to just miss the slide. You need to take off the subframe with airbox to check this.

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get the r & d racing powerbowl have same bike and solved all the problems also use a stock 2009 yz250f neddle

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