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My mtd is a o8 model 139cc push mower i choke the mower it starts five seconds later it dies

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  • Mtd Master
  • 40,764 Answers

Clean out the fuel bowl as there may be water in it or the main jet is blocked

Posted on Apr 28, 2015

  • 1 more comment 
  • Mat Nicholas
    Mat Nicholas Apr 28, 2015

    Ive cleaned tank out new gas checked lines and bowl cleaned it took carb off cleaned baffles where could.i.get a.diagram for the carb

  • Mat Nicholas
    Mat Nicholas Apr 28, 2015

    And is the main jet center of carb where the screw to seat the bowl is

  • Eugene Rounds Apr 28, 2015

    Yes many times the bowl nut itself is the main jet. It clogs easily. When cleaning it be careful as to not enlarge the metering hole.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: Mower starts up great and then dies

If it's a briggs engine, sounds like you have water / debris in your carb fuel bowl. Using spray carb cleaner will only work if you remove the bowl and clean the carb jets. Also, you could have water in the gas tank as well. First, remove your air filter, then remove the 3 screws that attach your filter bracket to your carburator and mower. Take off your fuel line at the carb and drain all your gas into a clear jar. If it looks very yellow, cloudy, or see water in the bottom of the jug, change your gas. Using a half inch socket wrench, after gas line is disconnected, remove the fuel bowl and clean with carb cleaner. Also, examine the bolt you just removed. There are 2 jets in the side and one at the end. Using the carb cleaner, make sure they are clean as well. Use the carb cleaner extension tube to spray up inside the bottom center of the carb, where the bolt threads, to clean that area as well. After all this make sure ur float assembly is intact and reassemblt the bowl to the carb and reattach the the fuel line. finish bt reattaching the air filter support bracket makinf sure the gasket between the carb and the bracket isn't damaged.

Posted on May 25, 2009

  • 125 Answers

SOURCE: yard machine mtd 123cc mower stalls after starting

dirty gas. the fuel bowl likely has junk in it which plugs the jets as soon as it starts. you may get luck just emptying the carb bowl but a good carb clean and new gas will do the trick. (dump out the old gas

Posted on Aug 16, 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

hunter19_46m
  • 7482 Answers

SOURCE: My 2 year old Yard Machine 21in 139cc MTD engine

Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please do not forget to rate me, Thanks
Good Luck, I hope this helped

Posted on Jun 03, 2010

flyer4play
  • 1 Answer

SOURCE: Yard machine 139cc will only run short time with choke

i have the same problem with my 139cc model, but no leaking gas. it just runs in choke on only.

uuuughhh!!!


Posted on Jun 10, 2010

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1 Answer

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you more than likely sucked crap into the carburetor jet. Drop the Carburetor Bowl and check the Jet for an obstruction

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Wont start


Your problem may be in the kill switch. To check, spray some starting fluid into carburator directly and pull start. If it sputter runs for a few seconds then dies chances are the kill switch is choking engine trottle as a built in safety feature. If you have to hold a bar down while pulling cord, that disengages the switch. You should be able to see if cord extends. If it's kinked I would replace the entire cable. It's cheap and relatively easy, just pay attention to how you take the old one off. B&S engines are very basic and very easy to fix.

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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.

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Model 54 m runs only on choke for a few then dies


Change out old fuel,change in line fuel filter if there is one - you may have one in the tank, remove and clean carburetor passages - be careful with the gaskets - if you do not tear them they can be used again - make sure screws are tight. You might have to make adjustments to your mixture screws if applicable on the carburetor,clean air filter and plug. Recommend the new E3 spark plugs.

May 02, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

My 3 year old Yard Machine 139cc started (choke out), but then began running excessively fast after pushing the choke back in. A few weeks later, it still started (choke out) but now ran very fast even...


Check the carburetor see if all the bolts are tight.check the cylinder head gasket take off plug wire make sure it is away from plug so it wont start. Pull start rope can you hear air being pulled into the engine? if so the head gasket has ruptured or head bolts came lose. Ensure all parts are tight. Ensure fuel lines are not clogged. Check fuel level.

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1 Answer

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

May 07, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

MOWER RUNS FIVE MINUTES THEN STOP AFTER IT WARMS UP


Check your automatic choke ... a cold mower needs more choke, and the auto-choke should release when the motor warms and runs smoothly. If the choke is sticking, the motor will die when it gets warmed up, then start again after it cools down.

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2 Answers

Yard machine 139cc will only run short time with choke


Check the float and the adjustment screw on the bottom of the carb. Usually if the float stays up it will continue to leak gas and also will only run on choke. Spray some carb cleaner in there and try to get rid of any debri also try changing your air filter or cleaning it

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