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400ex jetting

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Old May 29, 2002 | 11:54 PM
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dsbomb's Avatar
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Trailblazer
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hey 400 experts, i have a 2001 400ex with kn filter and white bro. slip on pipe. what size main jet do i need dynojet size. im in ky , low altitude
 
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Old May 30, 2002 | 12:08 AM
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If you're running with the airbox lid on, start out with the 155 dynojet main jet. That should get you pretty close. I run that jet in my 400ex, and I ride mainly between sea level and 2000-3000 ft.
 
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