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Hesitation of full throttle - too rich or too lean?

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My Honda CRF250X will some times hestitate (or gurgle I like to call it) when hitting the throttle quickly off idle. It has the air box cut open, a FMF Q pipe, and its been rejetted with the JD kit per the instructions (158 main I think). When it does this does it mean its too lean, or too rich? Is it main or needle that needs adjustment?

Any advice appreciated - thanks! 😢

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The main jet is the principal factor in mixture at wide open throttle. If it runs fine on open throttle but only hesitates when you first open the throttle, it is the accellerator pump instead of the main jet. There are several ways to combat this but changing the leak jet is the most common. I have a post on the YZ250F forum from a few years ago that describes how to adjust the leak jet.

Mark Cantrell

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