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Thread: 1985 Yamaha YT125 main jet size

  1. 07-21-2014, 05:03 PM #1
    Tri-Motor's Avatar
    Tri-Motor
    Tri-Motor is offline New to the board Arm chair racerNew to the board
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    1985 Yamaha YT125 main jet size

    My '85 Tri-Moto is running lean at WOT, the pilot jet is stamped 25 but the main doesn't have any number stamped on it. Does anybody know what size the stock main jet is so I can go up a size. I have the needle clip in the bottom groove and its still lean at WOT.
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  2. 07-24-2014, 04:31 PM #2
    MTS's Avatar
    MTS
    MTS is offline Power User The day begins with 3WW
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    200 if i remember right, sounds like you may want to check your crank seals also.
    1985 Tri-Z-

    Quote Originally Posted by mywifeknowseverything
    Just hit the Freakin Gas and Hold on!!!!!
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  3. 07-25-2014, 05:51 PM #3
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    Tri-Motor
    Tri-Motor is offline New to the board Arm chair racerNew to the board
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    New crank seals and top end in December. Basically in 4th and 5th gear on flat ground it flies at WOT but even a slight incline it seems to struggle a bit. Plug is a medium tan color
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