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Mower not running at set speed, choking

Honda Lawnmower Starts well Runs well when fully choked When the mower is set to high or low speed the RPM runs high, low, high, low. The "governer" seems to be opening and closing the butterfly valve Cleaned and gapped the plug Changed the oil. Cleaned out old gas, even in float bowl and filled with fresh gas Lubricated all moving components on outside of mower Any ideas Mike

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  • mlawrie May 10, 2009

    Thanks fancyface818

    I did double check your idea.

    This only killed the engine faster.

    The govener located in the oil pan assembly is connected to a lever that moves an arm, that is connected to the carbs butterfly valve.

    If I stop the arm from moving, this steadies the RPM, however with this device "disabled" the engine speed is not govened allowing the RPMs to increase to what I think could be near redline.

    I've included an image of the side assembly

    Item #1 in the govener arm. This connects to the butterfly valve using item #2
    The govener is item 7 and connects to the arm (outside) by item #12, below

  • Anonymous Mar 29, 2014

    Honda HRX475 SXE drives too slowly even when on high speed. I have adjusted clutch cable at handle end.



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You should have an air/fuel mixture screw on the carb somewhere. Start the engine and turn it one way then the other a small amount at a time. One way it will get worse and one way it will get better. Keep turning till it smooths out

Posted on May 09, 2009

  • fancyface818 May 10, 2009

    trust me the carb is either out of adjustment or it is dirty



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