Help with 2002 FX 140 90psi in back cylinder

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  1. #1
    Resident Guru blazinbikerr1's Avatar
    Join Date
    Mar 2008
    Manchester TN

    Help with 2002 FX 140 90psi in back cylinder

    I just bought a 2002 FX140 It starts up and runs fine, but the compression is 180,180,180,90. I'm trying to figure out if it could be a stuck valve or stuck rings? I do notice when it is running and I take the cap off of the oil reservoir smokey air is puffing out also with the air cover off I see some smoke coming out of somewhere in the box, but I cant pinpoint where. also I'm going to be pulling the motor anyway cause I'm going to use it in an MR1 Swap into an SUV. Any help would be greatly appreciated.

  2. #2
    PWCToday Newbie Matchsticks's Avatar
    Join Date
    Apr 2019

    Re: Help with 2002 FX 140 90psi in back cylinder

    Pop a head off and take a look at the valves, for a MR1 to have issues like that it most likely means that the oil maintenance was lacking. If the valves look good then you’re loosing rings In that cylinder

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