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Mtd 139cc ohv engine will start with primer, but stalls within two or three seconds

I have cleaned the carb twice and have installed new float, needle valve, main jet and tube, still wil not stay runing

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Ensure oil is full. Engine has a low oil cutoff. 30w oil. Replace carb only about $27.

Posted on May 28, 2014

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Posted on Jan 02, 2017

  • 37 Answers

SOURCE: Carb will not shoot gas in engine w/primer.

Hi, check the primer rubber too see if there is small leak in it. and replace the gas tubes inner and outer

If this doesn’t work for you please write back. Thanks,

Posted on Nov 23, 2008

rburroak
  • 14 Answers

SOURCE: MTD Yard Machine 22'', 4.5HP, 190cc push lawn mower won't start

The primer bulb might be damaged, or the carburator diaphram could have been damaged if carburater cleaner was used.

Posted on Jun 19, 2009

panilling9
  • 284 Answers

SOURCE: 4.5hp Sears/Tecumseh motor starts and dies in 5 - 10 seconds.

metal or plasic float?

Posted on Jun 21, 2009

  • 30 Answers

SOURCE: won;t start

Hi, it is possible that even if you changed gas, assuming water was in the tank as your original problem, that some stayed in the bottom. If you pump the primer while it fires up and it helps to keep it running, you still have some water.

Posted on Sep 09, 2009

  • 143 Answers

SOURCE: Lawnmower won't start

Remove the bowl from the carb. and blow it out with air.

Posted on May 07, 2010

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1 Answer

MTD lawn mower won't stay running.


Did you empty the carb bowl and clean out any old fuel & contaminants? This is the most effective way to determine fuel issues. It also gives you the opportunity to remove all old fuel from the fuel lines, filter, & drain the tank bone dry. You may have already introduced water from your previous efforts so take out the plug & pull the cord a few times to dry out the cylinder. Next start the first time with starter fluid since you may still have contaminants in the primer system. In the future use only non-ethanol fuel, a marine grade stabilizer such as "Sea Foam" and replace all fuel every spring. Fuel begins to varnish and break down after 1 month unless stabilizer is used. Ethanol gas absorb water from the surrounding air in about 2 months & only gets worse.

Sep 06, 2015 | Mtd Garden

1 Answer

Machine is 1year old and after priming will run for 5 seconds will stall. I presume the carb is the problem. Is there a video on how to clean this properly for this model.


If there is a fuel bowl on the carb take that off and clean it out. There also should be a fuel jet possibly in the bolt that holds the bowl on. Make sure you blow them out and are clean. Make sure your gasket is replaced properly when reassembly.
You could run carb cleaner through it as well. Dirty carb sounds like your problem.

May 27, 2014 | Yard Machines 11A08MB006 22Inch 139cc MTD...

1 Answer

My 5 hp MTD mower keeps stalling after running for a couple minutes. I then prime it excessively and it will start back up and do the same again. I have cleaned the carb and replaced the priming needle,...


You probably have already done this, but I had a JD 111 rider awhile ago and did most of the things you have done with no success. Then I replaced the fuel line and "BINGO" it worked great after that. Seems the line had a weak spot and would **** closed when trying to start.


Good Luck

Jul 10, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

My mtd(11A-54MC552) lawnmower won't start. changed: spark plug, fresh gas, clean air filter,


The Flywheel has a brake and switch assembly on that is item 8 of this link: http://www.ereplacementparts.com/mtd-11a54mc006-2009-push-walkbehind-mower-parts-c-20039_20100_133234_21459.html#part_343018

The switch is made or unmade by the position of the user safety bar on the handle. When the cable between the handle and the flywheel safety brake wears or needs adjustment the safety switch continually grounds the ignition so there is no spark. You may have to adjust the user safety bar cable at the engine flywheel brake switch area by losending the mount screw and moving the cable jacket further away from the switch. Then re-tighten the mounting screw.

If this is the first start of the season you may have to remove the carb float bowl as shown on the bottom of item 14 the above link to clean out the jet orifice in the threaded area of the carb. Make sure you remove all debris in the carb float bowl area. You should also have fuel flow anytime the float is positioned below horizontal.

If none of the above corrects the problem respond here and I will help you.

Thanks for choosing FixYa,
Kelly

Jun 10, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

2 Answers

Crazy question but where is the primer button on the yard machine 139cc 21" lawn mower???????


The primer button is usually on the carburator of your machine. Most of the time on the side of the carburator , but sometimes on the front of the carburator. GOOD LUCK.

May 29, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

Yard machine 139cc ohv. wont turn over. cleaned carb and bowl. bowl gets gas but gas wont get into carb . think poss vacuum problem


Clean the brass bolt very well that holds the bowl on the carb. Pay very close attention as their are some very small holes in the smooth part of the bolt near the top, as well as the bottom. Use NO metal objects to clean this bolt.It is the main jet of the carburetor also. Once cleaned properly, your fuel flow into carburetor and engine should be restored.

May 24, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

Yard machine carb issues


clean the main jet and check the pickup tube if this carb is a tank mounted side draft carb.

Jul 18, 2010 | Yard Machines 11A08MB006 22Inch 139cc MTD...

2 Answers

The engine started then few minutes later died after cleaning the carburator,float bowl assy, air filter .and fuel lines re assembled the engine and fuel is leaking from air filter and primer


You may need to also thoroughly clean the small holes in the brass bolt that holds the carb bowl on...holes at botttom and across the middle where there are no threads. Don't use anything that will enlarge these holes as this bolt is also the main jet of the carburetor.

Jul 13, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

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


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.

Jul 07, 2010 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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