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Thread: jetting help

  1. #1
    Senior Member Monsterjumper's Avatar
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    Default jetting help

    i have a 2004 yfz450 i had a yoshi full system and know i have a tdc full system. i have a crappy dyno jet kit. right now i have a 160 main, the pilot they give me. 1 1/2 turns on the air scrwe and 5th clip on the needle. this ran great with my yoshi. know with the new pipe he told me to run a 185 main, 48 pilot, 2 1/2 on the air and 4th clip on a dirt bike needle but these are keihen jet numbers. will i be fine if i run it like this in verde valley? and does anybody know the jetting size differences between keihen and dyno jets.
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    Administrator Jeremy's Avatar
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    I posted a thread with DynoJet to Keihin conversions.

    DynoJet / Keihin / Mikuni jet conversion
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  3. #3
    Senior Member Monsterjumper's Avatar
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    thanks that helped alot. so if i go from 1 1/2 turns on the air screw to 2 1/2 turns will it run richer and what will it do.
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    if i where you i would leave the jetting the same, the elevation at verde valley is not that much of a difference. i have been up there a few times, no problems with my quad.

  5. #5
    Senior Member Monsterjumper's Avatar
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    yeah im just hoping that it wont be to lean since this new pipe has mor flow
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    if its running good down here, i wouldnt worry about it. theres a few guys up there in verde valley that i know, they dont change anything when they come down here.

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