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Thread: jeting help

  1. 04-08-2009, 05:56 PM #1
    riderssb250x
    riderssb250x is offline Senior Member
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    jeting help

    i need help jeting a 400ex..
    stock motor
    no airbox lid
    foam filter
    fmf powercore 4 exhaust tip

    jeting is at stock now what should i do ? main jet sizes? pilot sizes? needle position? air screw fuel
    ? lemme know thanks
    Full mx 02 440ex, houser,pep,baldwin racing,gt thunder much more..

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  2. 04-08-2009, 06:01 PM #2
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    DirtMonkey
    DirtMonkey is offline I need more money.....
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  3. 04-08-2009, 06:01 PM #3
    Newrider08
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    I would try a 155 main, 42 pilot, 2 1/2 turns out and needle on the 3rd clip from the top
    2002 Honda 400EX
    White Brothers E series
    Sparks Timing Advance Key
    42 pilot jet
    152 Main
    ITP wheels
    Maxxis Razr2's on all corners
    uni filter
    newer yellow plastics
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  4. 04-08-2009, 10:35 PM #4
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    Sanddraging28
    Sanddraging28 is offline Senior Member
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    i agree on the 155 main jet, but IMHO a 42 pilot is to big. i would go no bigger than a 40 pilot.
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  5. 04-08-2009, 11:15 PM #5
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    leasureryan
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  6. 04-09-2009, 05:01 AM #6
    Newrider08
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    yeah you might be right about the 42 pilot, I live in Missouri with no choke so it seems that is always my first answer as that is what I run but if you still have a choke the 40 will work for ya
    2002 Honda 400EX
    White Brothers E series
    Sparks Timing Advance Key
    42 pilot jet
    152 Main
    ITP wheels
    Maxxis Razr2's on all corners
    uni filter
    newer yellow plastics
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