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

It runs on a prime so that eliminates an ignition problem and indicates a fuel problem. You are on the right track, you just missed something in the carb. Remove the carb and clean it again. Be sure all passages are clear. you mmentioned that you replaced the inlet needle- what about the seat? They come as a set and should be replaced together. Be sure you clean the passages in the fixed jet also.
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I can start the lawn mower but it will stall if I press the primer button it will stay going....when it warms up I can get it to run but if I start to mow it will stall

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1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
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I’m happy to assist further over the phone at

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2 Answers

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1 Answer

Gas Lawnmower start and then shuts off....

Ok here are 2 possible solutions.
1. If you have a mower with a sediment bowl under the carb and flat paper air filter, try this. Drain gas from gas tank. Remove the screw that holds the air filter cover. Replace air filter is dirty. Remove the two or three screws that are holding the flat plastic back of air filter cover. Remove the little gasket that is between the flat plastic back and sediment bowl. Make sure you remove all of old gasket. Clean the area around the sediment bowl so it is free of dirt and grim. Use a 1/2 socket (usually) and remove the bolt on underside of the bulb. The remaining gas in the bowl and a little left in the tank will leak out. I let it all run out so if any water is in tank it emptys on its own. Remove the bowl and clean it out with clean rag or paper towel. Use some carb and choke cleaner to spray the carb. Reattach the bowl, and tighten the bolt making sure the ruber gasket between the bowl and carb is not twisted or you will have leaks. Install a new gasket between carb and air filter back replace 2 or 3 screws and air filter and cover. Refill with gas, prime it and then try and start it.

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.

Good luck. Let me know if this helps.


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1 Answer

Lawnmower starts but won't continue to run

if you are getting no fuel to the plug you either have a stuck float, plugged fuel line or filter. does the gas reach the carb bowl? does the mower have a fuel pump? if so the diaphram might be bad.

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1 Answer

Mower won't stay running

carb is gummed up. carb cleaner is the only thing that will help, Get it at walmart, spray can usually less than $3. Comes with a wand (straw) for spraying in small holes etc. Take the air filter off and look for small holes around inside the carb intake, stick the straw right in those and shoot, WEAR goggles or classes and rubber gloves, stuff is nasty. If it still won't run you will need to do some disassemble of the carb, if it has a bowl remove it and wash everything out with the cleaner.DO NOT however get the carb cleaner on the bowls top rubber ring it will wreck it. Be careful to put the float and needle and seat back as they were. The brass screw that holds the bowl on has some tiny cross holes in it, one strand from a wire brush works great for cleaning them out. Good Luck, Chuck

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8 Answers

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