Question about Mg International MasterCut 20" 123cc Push Gas Powered Lawn Mower #11A-02MG000

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Engine RPMs keep going up and down, not a steady engine speed.

It seems to be running too rich and using a LOT of gas way too quickly.
I sprayed carb cleaner in the carb several times and also sprayed some seafoam through the carb too but no help.
The rpms keep going up and down and doesn't have much power.
The plug looked very black and sooty too.
Its like its not getting enough air and too much fuel. The air cleaner element IS clean.

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  • Kelly
    Kelly May 12, 2010

    Is there an engine model number on the side of the engine block near where the oil fill area just above the base? I really need to know if it is a Briggs and Stratton or an MTD or Honda OHV engine and the engine model number to properly assist you. If it is a Briggs and Stratton the engine model and type are near the spark plug on the upper engine cover face. I really think you either have a stuck float or a direty needle and seat in the carb and need to know what engine it is to pass you the correct information. Thanks, Kelly

  • daddiochevy May 12, 2010

    Its a Briggs 4HP model 10A902.

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By your description, you have a Briggs & Stratton carb-on-the-tank engine?

Replace the carburettor diaphragm. It's either holed or work-hardened. Costs pennies.

Posted on May 12, 2010

Testimonial: "I suspected it had Something to do with the carb. but just wasn't sure enough to tear into it before I got input from someone more knowledgeable about small engines than me. Thanks so much for your help. I'll take the carb. off and replace the diaphram."

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Posted on Jan 02, 2017

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