Yard Machines 21 in. 140 cc Walk-Behind Self-Propelled Gas Mower-12A-A13K729 - The Home Depot
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Yard Machines

Model # 12A-A13K729

Internet # 203307433

Store SKU # 339796

21 in. 140 cc Walk-Behind Self-Propelled Gas Mower

Yard Machines 21 in. 140 cc Walk-Behind Self-Propelled Gas Mower

This item has been discontinued.
The Home Depot no longer carries this specific product.

$249.00 / each


Model # 12A-A13K729

Internet # 203307433

Store SKU # 339796

Store SO SKU # 639830

The powerful Briggs and Stratton engine delivers solid, efficient power to tackle the yard. This 21 in. Self Propelled Mower offers 6 cutting positions to cut grass down to size, the single forward speed unit offers easy maneuverability. This unit also of

California residents: see  Proposition 65 information

  • 140 cc Briggs and Stratton 550e OHVprimer engine
  • 0.8 qt. gas capacity
  • SAE 30 Arnold brand oil
  • 18 oz. oil included
  • 21 in. steel deck
  • Dual lever, 6 position cutting height
  • Height range 1.25 in to 3.75 in
  • Rear bagger included
  • Mulch plug included
  • Adjustable loop steel handle with indent
  • 1 forward speed bail control
  • 8 in. front wheels
  • 8 in. rear wheels
  • 2 year limited warranty
  • Home Depot Protection Plan:

    Home Depot Protection Plan

Info & Guides

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Assembled Depth (in.) 
70 in 
Assembled Height (in.) 
36 in 
Assembled Width (in.) 
22 in 
Blade Length (In.) 
21 in 
Rear wheel size (in.) 
Size of Yard 
1/4 - 1/2 Acre 
Blade Brake 
CA (CARB) Compliant 
CARB Compliant 
Cutting Options 
Cutting Width 
21 in 
Drive type 
Front-wheel Drive 
Engine Displacement (cc) 
Engine Make 
Briggs and Stratton 
Bagger,Blade Brake,Rust resistant deck,Tool-free adjustments 
Fuel Type 
Fuel tank capacity (gallons) 
Engine oil 
Lawn Mower Type 
Walk Behind 
Maximum cutting height (in.) 
Minimum cutting height (in.) 
Mulching Capability 
Number of Blades 
Number of adjustable handlebar positions 
Oil capacity (oz.) 
Product Weight (lb.) 
75 lb 
Start Type 
Sloped with Obstacles 
Walk Behind Mower Type 
Self Propelled 
Warranty / Certifications
Manufacturer Warranty 
2 year limited 


Rated 3.7 out of 5 by 57 reviewers.
Rated 5.0 out of 5.0 by Works better than expected! Simple operation and very easy assembly. My Home Depot is in a small town and does not carry a full complement of products like the internet store and I am in California where the most stringent of air quality restrictions apply so getting a new mower for me was a little more difficult than normal. The local store did not carry this particular mower so I ordered it from the internet store. I came via UPS and was delivered on the exact day scheduled and in very good shape. It took me only one hour (I'm 62) to assemble it and have it ready for work! Started on the first pull right and worked like a charm. I chose the Yard Machines walk behind self-propelled mower because I wanted a rear bagging self-propelled mower and it is. Although the bag looks small it holds a pretty big load and is surprisingly easy to use. It is much easier than my old Murray mower. The push bar mounted clutch for the drive is very easy to use and allows for simple engaging of the drive. It is front wheel driven and pulls the mower ahead. To make it pull harder you just lift the handle. This allows you to walk at your own pace, especially going uphill. I'm 62 and have had two coronaries so getting a mower like this was the only way for me to keep taking care of my yard. It works well and mows great. I'm very happy with it and would recommend the Yard Machines walk behind self-propelled mower to anyone! July 18, 2013
Rated 1.0 out of 5.0 by Dud I bought this mower and took it home the same day to do my first mow with it. I got about 1/4 of the way through the first mow and the self-propel completely stopped working. In fact, the left front wheel wouldn't move at all even when I didn't have the self-propel engaged. I just took it apart and put it back in the box to take back to Home Depot. I ended up purchasing the Lawn Boy model that is similar to this one, but about $30 more. The Lawn Boy was slightly easier to assemble and took care of the second half the lawn without a problem. July 26, 2014
Rated 1.0 out of 5.0 by Not Impressed It broke down the second time I mowed my yard, so it was definitely a waste of money for me. Maybe it would be OK if you have a very small yard. April 28, 2015
Rated 1.0 out of 5.0 by VERY WEAK_STALLS CONSTANTLY THIS MOWER HAS NO THROTTLE CONTROL, AND THE FACTORY SETTING IS ON LOW I CANT BELIEVE I SPENT THIS MONEY ON A BRAND NEW MOWER AND I CANT CUT MY LAWN. I ALREADY GAVE AWAY MY 17 YEAR OLD ONE THAT WORKED FINE BUT NO SELF-PROPEL. I WISH I HAD MY 17 YEAR OLD MOWER BACK BECAUSE ITS SUPERIOR TO THIS BRAND NEW BRIGGS AND STRATTON. I mow my lawn weekly. I wildly regret not returning this pile of garbage when I could. I am writing this now while coverd in sweat from my 17th time restarting the mower. Finally got mad and came here. Why is it that when I used to mow lawn as a kid in the 80's, those old lawnmowers had absolutely NO problem cutting a lawn. In the year 2015, Briggs AND sTRATTON cant get it right. May 13, 2015
Rated 5.0 out of 5.0 by Best value, best online order catalog, best customer service. As a residential gardener service, i require machines that start every time and hold up to daily use. Although this machine is not commercial rated (no drain plug) it has not failed yet. I purchased three (3) and they start every time. Sorry to see them go discontinued. I shop Home Depot Huntington Park #1002 3040 Slauson Avenue Huntington Park, CA 90255 | Phone: (323)587-5520 Mon-Sat: 6:00am - 9:00pm, Sun: 7:00am - 8:00pm The Service Managers are the best! edsgardenerservice; ed February 11, 2014
Rated 1.0 out of 5.0 by not solid This mower is a very basic self propelled which is exactly what I wanted. It is not a very strong machine, one rock and it destroyed the engine. I wouldn't recommend May 12, 2015
Rated 5.0 out of 5.0 by Much better than expected I'm glad our old mower won't start. This one is so much easier to use. Very simple height adjustment (old one was a major pain). Easy to start. Happy customer so far. To be fair, this was the least expensive mower in it's class so our expectations not were very high. However, expectations met and exceeded. July 16, 2013
Rated 5.0 out of 5.0 by Good mower. This mower is good. Starts easy. Very nice quick self propel. Well built, built to last. Very manuverable and not too heavey incase you must pickup and move into a truck. Easy to adjust height and the wheel adjusters are strong. The motor starts plenty easy and is strong enough but I prefer briggs and strattons 190cc engine over this to be honest. I even think the briggs and stratton 190cc uses less gas and is stronger and quieter. I think the recoil is a little cheap on this mower but I've used it alot and it hasn't broken. April 12, 2013
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Store Exclusive. This item is available for purchase in select stores only.