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Thread: ATC 70 with 88cc kit - jetting suggestions

  1. #1
    Join Date
    Feb 2019
    Location
    PA
    --
    14

    ATC 70 with 88cc kit - jetting suggestions

    Guys; I'm inquiring if anyone knows the correct jets to use with an 88cc kit and maybe where to get them?

    Thanks again for all the help.

  2. #2
    Join Date
    Jun 2009
    Location
    Leander TX
    --
    2,219
    It's been a while but, a few years back, I put an 88 piston/cylinder kit on a TRX70.

    The TReX was smoking when I got it, so I installed the $100 big bore kit and lapped the valves. If it had any valve seals I replaced them.
    I left everything else stock - airbox, carb, pipe, head, cam, etc.

    I bumped the main jet up 1 size and it ran fine. I fiddled with idle mixture and speed as needed. I never did a plug chop or anything to test it because I only used it as a potty quad - ride up to the showers/potty when camping.

    I was very happy with this setup - it was quiet and hauled me around with no issues.

    I get jets here: Jets_R_Us

    If you're paying for shipping, might as well get a couple of pilot and main jets slightly bigger than stock.

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