SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Aug 2018
    From
    arnold mo
    Posts
    4

    Default 1996 polaris stl 780

    Have Polaris stl 780 my question is running with water, remove plug wire from pto or center motor sound changes. remove mag cylinder plug wire no change in sound.
    start with just mag cylinder plug it will run. all cylinder have 130 psi, rebuild carb


    thanks

    tom

  2. #2
    Joined
    Jun 2016
    From
    Clearwater, Florida
    Posts
    279

    Default Re: 1996 polaris stl 780

    Poor spark on the Mag ignition coil?

  3. #3
    Joined
    Aug 2018
    From
    arnold mo
    Posts
    4

    Default Re: 1996 polaris stl 780

    switched center and mag same thing, pulled carbs and checked reeds look ok

  4. #4
    Joined
    Aug 2018
    From
    arnold mo
    Posts
    4

    Default Re: 1996 polaris stl 780

    if i switch mag and center it does the same thing. pto and center are running and no mag. get on water at half throttle it run great no missing but more full throttle or low throttle starts
    to run rough. pulled carb today to check reeds help

    tom

  5. #5
    Joined
    Aug 2018
    From
    arnold mo
    Posts
    4

    Default Re: 1996 polaris stl 780

    this think at half throttle on water runs great but wide open cuts out or 1/4 open runs bad

    help

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