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

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

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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.

Posted on May 24, 2011


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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

139 cc ohv engine is racing how do I turn down the idle

get down and look at the carb. a little screw on top will allow you to adjust the idle, but;, check the choke, it is stuck in place or mal functuning maybe, but turning the screw right or left will set idle

Aug 07, 2012 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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1 year old 139 cc will not start. it will go for a minute but very low idle

was gas left in it for more than 30days?if so the carb might need a cleaning

May 12, 2012 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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I have an 22in yard machine that is hard to crank. if i put gas in the air filter, it will crank long enuff for the gas to burn off. i have cleaned the carb out 6 times. i work on small engines so i know a...

This is MTD's engine that they have made for them in China. It is a Honda clone. In the carb, there is a removable jet and stem that must be cleaned very well. Pull the carb. Remove the bowl. Look up from where the bowl screw mounts, you will see a brass slotted jet. Remove it. Next. from inside the carb bore, push down on the brass nozzle that extends up into the bore, it should come down thru the hole that you just removed the slotted jet from. Clean both the nozzle and the jet. Run a very fine piece of wire thru all of the holes in the nozzle. BE CAREFUL not to enlarge the holes, only get them clean. Reassemble. This is one of the more difficult carbs to get clean. Don't forget to flush and dry the fuel tank and fuel lines to remove any debris. Also, check with your local parts house to see if a replacement carb is reasonably priced. Most of the time they are pretty pricey, but sometimes I get surprised by how cheap one is.
Good luck!

Sep 10, 2010 | Yard Machines 11A08MB006 22Inch 139cc MTD...

1 Answer

Purchased new 09 won't start after new fuel, carb cleaned don't think spark plug bad

Squirt a little gas in the carb, get a new plug in there, see if it will fire, make sure the blade is on, won't run without it. If it won't fire, squirt some gas in the piston itself and try it again. Narrow down the problem. Only so many things will make it not run. Any kill switches, safety switches on it? Check it out.

Jul 29, 2010 | 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...

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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The engine star however is lack of pawer and soon stop

Drain the fuel system completely into a glass bowl and let it stand for about an hour. Look at the fuel and see if you notice a layer of water at the bottom. If there is two layers in the have water in the carb!

You should expell all the bad fuel and dispose of at a gas station that reclaims bad gas and oil.

Get a new clean sealable gas can and some fresh fuel and go from there.

Good luck and be careful

Jun 27, 2010 | Yard Machines 11A54MC006 21Inch 139cc MTD...

1 Answer

Lawnmower won't start

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

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

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