Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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Mower runs at high idle no matter how the carb is adjusted

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The carburetor is probably not the issue. There is a spring attached to the carburetor, the tab that it is attached to will control the engine "idle"speed. Adjust it lower for the mower to run at a slower speed. You should only need a pair of long pliers to do this. I hope this helps. If you have tried this and it is still not running correctly please click on add comment to let me know what you have tried. Thank you and I hope this helps.

Posted on Apr 06, 2011

  • York Street May 09, 2011

    I also had this problem after cleaning the carb. I have adjusted the tab and the part on the motor itself with the hex head screw. It is still idling at a high rpm. Any ideas?

  • Kiltnar May 10, 2011

    It could be an air leak. There is a gasket that goes behind the carburetor and one on the intake tube as it attaches to the engine. Also there is a rubber gasket that fits on the front of the carburetor, where the adapter for the air filter is bolted onto the carburetor. I've seen those give problems. If you take off the air filter adapter, check that the rubber "o" ring fits in between the holes for the bolts that hold it to the carburetor. If it does not go all the way to the bolt holes you need a new gasket ("o" ring). This could be your air leak.
    If this does not fix your high idle problem, then it could be that the governor inside of the engine is not working correctly. If this is the case then I would take it somewhere where you can get it worked on. The only problem with this is that the Tecumseh engine company shut its doors three years ago and parts are getting pretty scarce. I hope this helps you.

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