Question about Mtd 22" Yard Machine Push Mower

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Lawnmower won't start

I have a 21" MTD Yardmachine lawnmower 139CC OHV. I left mower with gas in it over the winter. Tried to start. Drained the gas tank and put in new gas and changed the spark plug. Still will not start.

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

Posted on May 07, 2010

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Jul 17, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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My lawnmower (yardmachine by mtd) runs for about 10-15min and then it starts to sputter if I shut it off and let it sit I can then start it back up and it will run again for about 10min or so before the...


This sounds like a fuel supply problem. Like there is a restriction in the fuel supply some where. Pull off the main fuel line from the carb and check for fuel flow. Poor fuel flow here can be either a fuel tank port clog or an in-line fuel filter (if so equipped) If the fuel supply is good there then the problem is inside the carb.

http://www.ereplacementparts.com/mtd-11a54mc006-2009-push-walkbehind-mower-parts-c-20039_20100_133234_21459.html#part_343018

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. where the bowl nut attaches. Make sure you remove all debris in the carb float bowl area. You should also have good fuel flow any time the float is positioned below horizontal.

Here is a little about my experience:

http://blog.fixya.com/index.php/2010/05/award-winning-service

Thanks for choosing FixYa,
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Jun 12, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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

1 Answer

The oilcap on the Yardmachine mower is really unusual. It is a small yellow cap that has 2 raised knobs/bumps on it, and no other discernable gripping surface for turning. How do I take this cap off to put...


Sounds like the good old fashioned Briggs engine oil cap. They're designed that way so that if you screw it on too tight (or the crud stops it from turning freely) you can simply put a large screwdriver between the two knobs and use it as a lever to get the cap unstuck. Hope this helps. Good luck.
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May 26, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

Where to find the spark pug on my 21inch 139cc mtd ohv lawn mower


It should be under a rubber boot between the valve cover *(stamped OHV or OHC) and the muffler.

Good luck and be careful. Dont pull that boot when the engine is hot!

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

1 Answer

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Straight gas. Look around, and you will see where to fill the engine with regular sae 30 oil, and on lawnmowers, if you have a place to fill it with oil, you don't mix oil with the gas.

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

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