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

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My 2 year old Yard Machine 21in 139cc MTD engine push mower won't start. I've replaced the spark plug, air filter, and starter pull cord. I've also flushed the fuel line. I've run out of ideas to get it to start. Please help.

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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

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First, I need to know... IS there a spark at the plugZ? To find this out unplug the spark plug wire from the plug. Insert another plug (or take the one in it out) and lay that against the metal head of the lawn mower, so that you can observe the gap portion of the plug to see if there is a spark leaping across the gap when you pull the pull start. If ther is a spark then your issue is with fuel, not with the electrical. There should be a little plastic red bubble looking thing on the side of the carberator. Thisa rubber ball thing should be pressed in three times to prime the engine. Set your choke on, squeeze the lever on the push handle of the mower while you pull the pulley. The lawn mower should start up after two or three good pulls. Make sure that you do not pull so hard that yuou accidently pull the deck over yor foot and the blade start to spin while chopping your foot off!! Excercise extreme caution!!

Posted on Sep 14, 2010

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My 21inch MTD Yard Machine has the cord stuck. I turned the mower over to empty out excess oil and when I tried to start it thw cord is wrapped around to tight and does not pull. Any ideas?

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle spacer.gif spacer.gif
Spark plug wire is disconnected Connect spark plug wire spacer.gif spacer.gif
Fuel tank empty or stale fuel Replace with clean, fresh gas spacer.gif spacer.gif
Blocked fuel line Clean fuel line spacer.gif spacer.gif
Faulty spark plug Replace, clean, or adjust gap spacer.gif spacer.gif
Engine flooded Wait to restart, do not prime spacer.gif spacer.gif
Air filter filled with dirt or debris Replace or clean air filter

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amiseybold;

First check for spark. Remove the spark plug. Leave the spark wire connected. Hold the plug against the metal of the mower engine so you have a ground and can see the gap of the electrode where the spark jumps across. Have someone pull the starter cord and verify that you have a spark. Hold it by the threads of the plug so you don't get a little spark jolt yourself.

go to an auto parts store and get a can of starter spray (it's actually ether), Remove the lawnmower spark plug and spray a little ether in the plug hole. Put the plug back and tighten it and see if it starts.
It will probably start, run for 5 or 10 seconds and then die. Repeat this procedure once or twice again and eventually it will start to draw gas from the lawnmower tank.

A seasonal tip. when you put the mower up for the winter, **** the remaining gas out of the tank, start the engine and let it run until it uses up the gas in the carburetor. This will make iot much easier to start in the spring

Hope this helps Good Luck Loringh PS Please give me a rating

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