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Thread: help with jetting,

  1. 01-02-2002, 06:48 PM #1
    yellow_ho_01
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    help with jetting,

    my friend has a 400ex, we are gwetting ready to put in the jet kit, he already has a K&N filter, and e-series pipe. just wondering wheres a good place to start with the jet kit.
    -ATV ORF 2 name- PRAY-37

    FOR SALE 2000 400ex: nerf bars,AC front bumper, ANSWER bars, brake block off plate, new clutch perch and lever, WB E-series slip on, K&N power kit(165 main with no air box lid), K&N filter(not installed) WB filter with pre-ware,RAZR front tires,RAZOR rears on 10" Douglas Alum., 14T front,38T rear sprocket, tether kill switch, front wheels reversed and more to come... removed choke butterfly, custom GORTEX shock covers, and pre-ware airbox lid. custom made oil cooler scoops, brush guards... , , and 16T and 36T gearing.

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  2. 01-02-2002, 06:54 PM #2
    004exkid
    004exkid is offline Senior Member
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    Search the archives there have been alot of discussions on that. What elevation is he going to be riding at ? Im making mine a 416 with full exhaust and xr cam and 6 vents in the air box lid. I plan on using around a 42 pilot and 165 main and move the needle if i ahve to. There is a good introduction to jetting in the "ex tech" section if you need to play around wiht it.
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  3. 01-03-2002, 09:14 AM #3
    Guest

    Thumbs up Jets

    I would start with a 40 pilot jet and a 155 main. Raise the needle one notch. If it sputters when letting off, drop the main down to a 152. If the 155 runs great try a 158 or 160. A lot depends on the riding. Woods or open trail. Don't forget to check the plug for too lean.
    Put some vents in the lid, it helps.
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