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Mower will not run in high speed idles at one speed push throttle it runs at the same speed then stalls out whith lots of gas in the carb

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  • deedeeshouse Jul 25, 2010

    you asked mod.#20101 x31 B it is a pulsa prime carb ive put a new diaphram on it and cleaned the tank & blew out the screenn when i have it idling i can rev it up by moving the choke lever on top of the carb thanks for your help im 82 and it is easier to use a mower than a pair of sissors ha ha.

  • deedeeshouse Jul 25, 2010

    P. S its a briggs and stratton motor

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Your carbs main jet is most likely blocked. When the throttle goes off the idle jet to the main jet there isnt enough fuel flow and the engine stalls.

You need to removed the main jet and run a small piece of wire through the main jet to clear it. This is a good time to look at the inside of the float bowl to see if you have excessive water, rust or dirt accumulating that is a sign you should clean and drain the fuel tank and lines as well. The main jet is actually the bolt that holds the fuel bowl on the bottom of the carb! You need to look very close at the jet near the top of the threads to see the little whole there and clean it. A wire brush to clean off the threads and fine piece of wire strand to clean the hole will do the trick!

If you dont have a bowl type carb you will need to remove the carb from the fuel tank and locate and clean the inlet screen and main jet and then remove the fuel tank and clean it out too.

Good luck and be careful.

Posted on Jul 16, 2010

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  • deedeeshouse Jul 19, 2010

    your hint was helpful but i have done that but it still runs at half throttle

  • john andrew manchook Jul 19, 2010

    Did you find the little tiny jet opening at the top of the threads?


    Have you drained fuel out completely and checked for water?



    Could you give me the mowers make and model so I can see the schematics of the carb too?



    We will get to the bottom of this! :-)

  • john andrew manchook Jul 26, 2010

    http://outdoorpowerinfo.com/repairs/brig...



    I see this type of carb has a huge plastic jet. This breakdown shows all the major parts and their function.



    I would put the mower at part choke where it runs the higher throttle setting and see if you have a vacuum leak somewhere.

    You can just spray a little WD at the base of the carb where it meets the tank and see if the unit bogs or throttle up.



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