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07 yz 450 bogs only with a fast twist of the throttle

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This bike ran great with no bog till i put on the fmf mega bomb header and 4.1 exhaust. A slow twist of the throttle is ok, (no bog) but if i hammer it from low to mid rpm's there is the hesiatation. It is all stock jetting still. This is my first 4 stroke, always been on 2 strokes. The spark plug likes like the way it should. Thought i would just ask someone, i really don't what to just guess. Thanks

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Most likely the jetting. You could do it yourself but i would take it to a dealer or some other motorcycle place and let them dyno and jet it to get the full potential and remove the hesitation.

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Install the JD jet kit and your problems will be gone. More flow out[muffler/header]=need more fuel delivery. The JD kit will tell you what mods to do such as removing air snorkle and stuff from the airbox. Very easy with a little mechancial skill-good luck

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adjust the fuel screw first. If that does not solve it then try a different leak jet

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my bike was doing the same thing and i got a r&d power bowl from my local honda shop for 90.00 and problem solved. i got tired of changing the leak jet .its super easy just slap it on go for a ride and adjust it untill the bog is gone .it took me less then 5 mins to get rid of that bog.i also did the ap mod instead of using the heavy spring that comes with it .

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