PowerSmart Gas Lawn Mower, 21-Inch Push Mower with 140cc OHV Engine, Steel Deck, 3-in-1 Bag/Mulch/Rear Discharge, 6 Height Positions, 10” Rear Wheels
Condition: New
$389.00
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Availability:
Only 4 left in stock, order soon!
Arrives
Thursday, Oct 29
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At a glance
- Condition
- New
- Set
- 3IN1 Push 144cc OHV
- Model
- B8721S2
- Dimensions
- 32.9"D x 16.5"W x 22.6"H
- Color
- Black+R
- Material
- Alloy Steel, Metal
- Power Source
- Gas Powered
Features 5
- RELIABLE 140CC OHV ENGINE Delivers dependable startup and powerful performance, making it easy to mow through thick, tall, or damp grass without bogging down.
- 21"" DURABLE STEEL MOWING DECK The wide, heavy-duty steel deck ensures faster mowing with fewer passes, providing clean and even cuts across larger lawns.
- 3-IN-1 CUTTING OPTIONS FOR FLEXIBLE USE Switch between rear bagging, mulching, and rear dischargeideal for collecting, recycling, or naturally distributing grass clippings.
- REAR-WHEEL DRIVE WITH 10"" WHEELS Designed for smooth propulsion, the rear-wheel-drive system combined with 10"" rear wheels improves traction on slopes and rough terrain.
- SINGLE-LEVER 6-POSITION HEIGHT ADJUSTMENT Adjust cutting height from 1.5"" to 3.9"" using a convenient single leversuitable for different grass types and seasonal changes.
Description
A Trustworthy Brand with Integrated Production and Local Support About PowerSmart PowerSmart is founded in the United States, headquartered in Itasca, Illinois, specializes in small engine equipments, such as lawn mowers, snow blowers, generators. Our Advantage We fully integrated design, manufacture, direct-sale, and service to provide reliable products and dependable service. We firmly believe that safe, high-quality, easy-to-use products and reliable services can make us stand out from our peers. We have been practicing this philosophy for years and have received good user feedback in years of sales. Like all tools and equipments, products sometimes are in need of repair or replacement. PowerSmart has 500+ certified repair center in U.S. & provide full replacement parts through IL headquarters. If you have any questions, please do not hesitate to contact with us, and we will do our best to assist you well!
Specs 24
| Brand | PowerSmart |
|---|---|
| Power Source | Gas Powered |
| Material | Alloy Steel, Metal |
| Color | Black+R |
| Style | Rotary |
| Cutting Width | 21 inches |
| Operation Mode | Manual |
| Product Dimensions | 32.9"D x 16.5"W x 22.6"H |
| Number of Items | 1 |
| Brand Name | PowerSmart |
| Model Number | B8721S2 |
| UPC | 840432710807 |
| Unit Count | 1 Count |
| Number of Packs | 1 |
| Manufacturer | PowerSmart |
| Item Type Name | Lawn Mower |
| Manufacturer Part Number | B8721S2 |
| Item Dimensions D x W x H | 32.9"D x 16.5"W x 22.6"H |
| Wheel Size | 10 inches |
| Maximum Adjustable Cutting Height | 9.91 centimeters |
| Minimum Adjustable Cutting Height | 3.81 centimeters |
| Number of Positions | 6 |
| Material Type | Alloy Steel, Metal |
| Style Name | Rotary |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 29
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
good mower
Set name: 21” 170cc Self Propelled Lawn Mower
The mower arrived ahead of schedule albeit two days, the packaging was intact as was the mower. setup was simple I put the the provided oil in the engine and snapped the retainers on the cables filled it with gas and it started on the second pull. my yard is 90 x 150 ft. and it has mowed it 6 times so far works as advertised. by the way I live in S. Florida and the grass grows long and fast. so far wouldn't hesitate to buy again.
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Reviewed in the United States on August 22, 2026 by LarrryR
Lightweight but not for thick grass
My mower went out so I needed to find an affordable one to use for a couple months. On the plus side, it is lightweight and easy to put together with a strong motor (144cc). Negative is the back guard is cheap and will not last and the side chute is small and easily gets stopped up. I've cut my grass three times. Normally I can cut my grass in 1.5 hours. With this mower, it takes me over 2 hours because it keeps getting jammed with grass and I have to stop, clear, and re-start. I first used the side chute. It is small and after about 20 feet it gets stopped up. Then after about 15 more feet the mower stops because it gets clogged with grass. I did not have this problem with my 125cc Murray motor. I have two areas in my yard where I planted zoysia grass. Those areas must be too thick with grass because the mower would get clogged and I have to walk very slow to prevent it from cutting off. Using the mulching option is pointless with thick grass. The guard on the back is thin and very flexible. If you pull the mower back, the guard will go under the blade. It lasted me 30 minutes before going under the motor and being chopped up. Luckily, it isn't needed because the back of the mower is low to the ground. This is the third mower I have purchased. It is the strongest but also it the most troublesome and the worst cut. Next year, I will be looking to see what Murray lawn mowers are on sale. Four months later, this mower is unusable. The plastic cannot handle the heat from the mower. One wheel broke off the front and the other is wobbly. The back guard broke off. I peg that holds the panel where the grass catcher attaches broke off so the panel can no longer be attached. The bottom of both sides of the handle at the bottom broke off. I contacted Amazon and PowerSmart was to get with me. They did not respond. The product is junk. It deserves less than one star. I wish I read the reviews at other sites.
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Reviewed in the United States on August 30, 2022 by Amazon Customer
Pleasantly surprised!
Set name: 21” 170cc Self Propelled Lawn Mower
Wow were we surprised. I was hesitant about purchasing a mower online. It had great reviews- with one minor one- the flap issue- they fixed that! Starts right up, very powerful motor, easy to use. However if your going from a front wheel self propelled mower to one Like this- a rear wheel self propelled it is different when turning. Plus this motor is larger than our old mower, so more powerful. If you’re hesitant like me- don’t be! Get it! It’s worth it.
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Reviewed in the United States on May 16, 2026 by PösX2
Good Mower for a 1/3 of an Acre Hilly Lawn
Set name: 140cc Self-Propelled - Side Discharge
We moved to a new house and went from a postage stamp lawn to 1/3 of an acre. And that 1/3 of an acre is basically rolling hills, so our previous battery powered mower wasn't going to be up for the task. I wanted something that could handle the lawn without breaking the bank. So I chose this mower. It does the job. I don't regret the purchase, but there are times that you can tell why the mower is priced where it is. For instace, the pull cord to start the mower comes unattached (it hooks to the handle) at least once every time I mow. (You have to depress the "power bar" on the handle to pull it out again.) If the bag is full it will sometimes fall off of the mower. (It needs to be emptied anyway.) Little things like that. Nothing that impacts its performance - and it does consistently devour 1/3 of an acre of grass. The power assist setting isn't something I use but my wife (the time she mowed the lawn when I was ill) mentioned that it helped her get up the hills. I've tried it once and for me it moves very quickly (brisk walk pace; I'm a leisurely mower, you know, sort of zoning out in a sem-meditative state as you walk behind it). With no power assist, I can mow the full 1/3 of an acre without refueling. My wife had to refuel while using the power assist. Long grass? Weeds in the back flower bed? The mower devours them all. I tend to think of 5 stars as excelleng and 4 stars as good. This is a good mower. Two thumbs up, but it does have its quirks. We'll see how well it holds up over time and I'll add to this review if necessary.
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Reviewed in the United States on July 5, 2025 by distilledknight
Follow directions and enjoy this great little mower
This is awesome LAWN mower I stress that this mower can handle any normal lawn. It is not a " back 40" mower What this mower is lightweight,powerful,maneuverable,fuel efficient. It is not all plastic, the body is steel, the plastic parts are not fragile, nor are they easily broken. The engine and drive shaft appear to be aluminum ( hence not a back 40 mower) Now my story... I ordered my mower to replace my broken mower, I received my mower quickly, assembled easily,oiled and fueled, she started first start. I mowed my yard and in an hour my mower had hit a baseball sized rock that was hidden in an overgrown patch of weeds. The mower stopped and seized the shaft was bent now here's the important part.. I was using the side discharge not bagging, both parts of the rock were held inside the mower they were not ejected! The mower body is not cheap, the engine is light not fragile and held together after hitting this rock. ( I will try to post pics) Now I was flummoxed to say the least, I got my paperwork expecting to get the runaround, I sent my information and all pertinent information to Amerisun ( the manufacturer) and in less than 12 hours got a personal response Amerisun immediately backed up their warranty and sent me a new mower, in one week ( today) I mowed my lawn again! Carefully checking for any debris. 👍 For general all purpose lawn I cannot recommend this mower or company enough they stood by their product. Buy this mower got nice lawn use this got an average lawn with crab grass buy this mower. Got a back 40 find another model from this company. Great customer service
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Reviewed in the United States on July 29, 2020 by buffalo1a
Please do not buy this lawnmower.
This could be the worst lawnmower I have ever used and I have used corded electric mowers. I was drawn in by the larger engine at a reasonable price. I have run this mower twice on a very small yard that usually takes about 30-45 min. To mow, weedeat and blow. The first run was not good, died constantly, and idled poorly, but I was mulching and the weeds were around 6". So, I decided to give it another chance using side discharge a week or so later. Same performance on 3 1/2" grass. Had to go super slow with it to keep it going and 3/4 of the way through it totally seized up. I thought at first the rope was just snagged, so I took the outside cover off that would normally open that part for removal and inspection, It did not. I had to remove the muffler cover and pull the gas tank just to get to the poorly placed screws. After doing so I saw that the motor had actually seized. Plenty of oil in the engine, cleaned the deck, tried to move the blade with a 2x4 from underneath, nothing but a squeek. My last mower was a walmart briggs and stratton, half the size, and about the same amount of money. It ran for six years getting beat up 7-8 months out of the year in texas running at least once a week for hours at a time. I'm not really sure how they made a mower look this good on paper and perform so poorly. I hope this review helps you make a more informed decision before purchasing this mower. I took a chance, please learn from mistake.
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Reviewed in the United States on March 27, 2021 by TheWolff
Does the job.... until it won't start any more!
Set name: 21” 170cc Self Propelled Lawn Mower
Final update: Drained out all the oil and gas from the crankcase and refilled with 20 oz new oil. Runs fine now. Fourth update: Tried running it with gas cap loose to check for plugged vent holes. Still dies after 30 seconds. Much smoke as it stops. $275 for 6 weeks of mowing grass. Cheaper to hire some kid to mow. Third update: Replaced carburetor with Alexa recommended carb. Fresh gas, new fuel filter. Engine starts and smokes excessively . After 30 seconds smoke goes away and engine dies. Second update: Installed fuel shutoff valve, drained fuel from carb. After reassembly, mower will start with a lot of smoke, run for 30 seconds and die. Oil is at fill level and super clean. Air filter is clean. Mower never smoked before this. Update to review: Mower will no longer start. I believe that gas is running through the carb into the cylinder. I filled the tank, and 1 hour later it was down 1 inch, and would not start. I tried removing the spark plug pull starting it about 10 times with the plug out, then drying off the plug and reinstalling but no luck. The next day, tank was down another inch. This mower was purchased about 6 weeks ago. I guess I can take it apart and try installing a fuel shutoff valve. Original review: I like this mower. Here are the pros and cons: Pros Easy to clean sponge air cleaner. One tiny coarse sponge, and one fine sponge. Wash, dry replace. Starts easily after one push of the primer bulb. Or none if the engine is warm. Packs a lot of grass into the bag. I estimate as much as 30 lbs of fine grass without clogging up the discharge. The mower came with 400 ml oil, a funnel for filling the crankcase, and a spark plug wrench. Cons The bars that control the kill switch on top, and the drive wheels on the bottom will KILL your fingers. I took away one star for this. As seen in the picture, I attached sections of black PVC pipe to each with zip ties. MUCH better. The metal pins on the grass catcher bag can slide too far to the side when you are hooking it on to the mower, so it may only hook on one side. I added 2 - 3/8 in nuts to each side, glued on with silicone seal. Much easier now. Not a huge issue, but the manufacturer could have pressed on a couple of plastic bushings here for cheap. The air cleaner sponges are tiny, and do not protect as well as a paper filter. If they become lost or damaged I don't know how easy it would be to replace. The engine seems a little louder than it should be for it's size. The main complaint I saw in other reviews was the rubber flap at the rear becoming detached. I easily removed it to begin with.
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Reviewed in the United States on July 11, 2026 by Mark Weisbach
from start up to completion purrrfect made my job so much easier.
Set name: 21” 170cc Self Propelled Lawn Mower
5 Stars super powerful if you have weeds and grass like I do on my 10 acre property, I've only used it for two days and it has tackled everything I threw at this mower think 4 foot weeds and only stalled twice, It mulches without clogging is fairly economical on the fuel. The wheel drive is spot on and 10inch wheels in back added bonus. I been using it on the highest level setting for cutting my jungle, however if you are cutting grass be sure to set it at the highest setting and work your way down so as not to scalp all your good effort.
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Reviewed in the United States on July 22, 2026 by anthony reabold