Question about Yard Machines 11A54MC006 21Inch 139cc MTD OHV Gas Powered Side Discharge

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Mower starts after priming, then quits. new sparkplug, air filter etc. cleaned bowl still no luck. cleaned out orifices in bowl screw. nothing. Suggestions?

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Evan though you cleaned the bowl, the float isn't "floating" correct in the bowl to raise the needle for gas to flow into the carb. The float and needle can be replaced. When you prime an engine the gas shoots straight to the carb. As when the engine is running the floating goes up and down to raise the needle for gas to flow.

Posted on Jul 07, 2010

  • bumpskr May 03, 2011

    my mower has the same problem. when it starts with primer the engine revs up and down for a long time. i could save it from dying by priming it. but now no luck

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Craftman 6.75 turbo walk behind mower with tecumseh engine wont run fuel on sparkplug


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1 Answer

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Ok here are 2 possible solutions.
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2. If your carb is located ontop of the fuel tank, remove the cross tip screws that hold carb to tank and get a new diaphram (fuel pump in a sense). Replace diaphram and reassemble in reverse. You will have to also remove the bolt that holds tank to motor and the little metal rod that goes from the govonor to the choke.

From what you stated I would think it is number 1.

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1 Answer

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1 Answer

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