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Thread: High idle

  1. #1
    Join Date
    Feb 2017
    Location
    Dunnellon,Fl
    Posts
    9

    Default High idle

    I just bought a PA 22-108 Colt. When the engine warms up, it idles at 1200rpm. Can a simple idle adjustment solve the problem? If not, any other solutions? Thanks!

  2. #2
    Join Date
    Nov 2006
    Location
    Mason, Ohio
    Posts
    342

    Default

    Ed,

    The idle speed can be adjusted with the idle adjustment screw on the right sided of the carburetor. But first make sure your throttle cable is pushing the throttle all the way closed and the throttle arm is up against the throttle stop screw. While you are at it make sure the throttle cable moves the throttle lever on the carb to both the full open and full closed limits. The engine should idle between 700 and 750 RPM. Once the throttle speed is adjusted, you can adjust the throttle mixture. It should be adjusted so that you get about a 50 RPM rise when you pull the mixture out to stop the engine. As the mixture is leaned, the RPM will raise slightly and then the engine will quit as the fuel flow stops. If you are quick, you can push the mixture back in and keep the engine running so you can try it again and verify the raise in RPM is there. The mixture adjustment knob is on the rear of the carburetor.

    Tom Anderson

  3. #3
    Join Date
    Feb 2017
    Location
    Dunnellon,Fl
    Posts
    9

    Default

    My mech will try those adjustments next week. Hopefully it's not a rebuild. Thanks again Tom!

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