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Thread: Yamaha 115/80 jet idle speed adj

  1. #1
    Member mudbuddy's Avatar
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    Jun 2010
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    Alaska, Mat valley
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    Default Yamaha 115/80 jet idle speed adj

    My Idle had dropped to 600, (on the tach ) stalls sometime when shifting between fwd & rev
    Seems like just a tad of play on the linkage,
    Books calls for 750 (+/- 50)
    found the idle screw tucked in on the left side under a black tab cover on the intake manifold
    turned it CW about 1/8 turn (used needle nose ) .
    will see next time out if I'm back to 700 - 800

    DSCF6870.jpgDSCF6869.jpg

  2. #2
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    Mar 2009
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    Petersburg, Ak
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    Default

    That is not an idle screw. That adjusts the air pressure balance between your top two throttle bodies and bottom two. If your idle speed is out of spec then there is something causing the motor to have the incorrect air/fuel mixture or timing. Fuel injected engines are programmed to regulate their idle speed using an idle air control valve and fuel injection duration or timing advance. This is based of input from a variety of sensors: throttle position sensor, atmospheric pressure and temperature, intake pressure, engine temp, etc. You should really seek out a dealer in your area on this one.
    Casey
    Yamaha Dealer
    Petersburg, AK

  3. #3
    Member mudbuddy's Avatar
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    Default

    Thanks
    Good idea

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