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Thread: jetting a yz400f/ 400ex

  1. 08-03-2006, 08:38 PM #1
    accorracer
    accorracer is offline Senior Member
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    jetting a yz400f/ 400ex

    i have a 400ex with a yz400f motor, 41mm fcr carb and hmf slip on exhaust.

    the problem is it won't start or idle with out the choke pulled out so i know i'm lean

    can anyone give me any idea of a base line jetting i have what seems to be 3 jets in this carb the sizes now are 52,52, and a 160

    is this close to what anyone else is running?
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  2. 08-04-2006, 03:50 PM #2
    accorracer
    accorracer is offline Senior Member
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    really needing pilot jet info m,ore than anything
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  3. 08-06-2006, 06:09 PM #3
    drue4mpg
    drue4mpg is offline Junior Member
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    i run a 45 pilot
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  4. 08-08-2006, 07:22 AM #4
    accorracer
    accorracer is offline Senior Member
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    damn i got a 52 in there and i still have to have the chocke pulled for it to idle at all
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