PowerSmart 21" Gas Self-Propelled Lawn Mower for Hills & Medium Yards | 170cc OHV | 3-in-1 Mulching/Bagging/Discharge | 6-Position Height | Alloy Steel Deck | Easy Start | Rear-Wheel Drive Review

Overview

The PowerSmart 21" Gas Self-Propelled Lawn Mower is a budget-friendly workhorse built for homeowners wrestling with hilly terrain and medium-sized lawns (up to about half an acre). With a 170cc OHV engine, rear-wheel drive, and a rugged alloy steel deck, it delivers reliable cutting power without the premium price tag of big-name brands. This mower is designed for folks who need affordable hill-climbing capability and don’t want to mess with cords or battery charging schedules.

Who Should Buy This

• Homeowners with hilly or sloped yards – The rear-wheel drive system gives you real traction on inclines, making this a standout choice if your lawn has noticeable grades.
• Owners of medium lawns (1/4 to 1/2 acre) – The 21-inch cutting deck and self-propulsion strike a good balance—fast enough for sizable yards but nimble for tighter spaces.
• Budget-conscious buyers who still want gas power – At under $400, this mower undercuts many competitors with similar features, making it ideal if you need performance without the premium brand markup.
• First-time gas mower owners – The “Easy Start” system and straightforward controls reduce the intimidation factor for anyone new to gas equipment.

Key Features Breakdown

170cc OHV Engine – This overhead-valve engine delivers decent torque for cutting through thick grass and climbing hills. It’s not a commercial-grade powerhouse, but it’s more than adequate for weekly cuts on typical fescue, Bermuda, or bluegrass lawns. OHV design also means cleaner operation and better fuel efficiency than older side-valve engines.

21-Inch Alloy Steel Deck – The steel deck is a significant upgrade over cheaper plastic or aluminum decks. It’s durable enough to handle occasional bumps against rocks or roots without cracking, and the alloy construction resists rust longer than standard steel. The 21-inch width is a sweet spot—wide enough to cover ground quickly but narrow enough to maneuver around flower beds and fences.

Rear-Wheel Drive Self-Propulsion – This is the key feature for hill performance. Rear-wheel drive pushes the mower from behind, giving you better traction when climbing slopes compared to front-wheel drive models that can lose grip. The self-propel speed is adjustable via a simple lever, though it’s not infinitely variable—expect a few fixed speed settings.

3-in-1 Capability (Mulch, Bag, Side Discharge) – You get genuine flexibility here. The mulching plug keeps clippings fine and returns nutrients to the soil. The included bag collects clippings for a clean finish. And the side discharge works well for tall or wet grass when you just need to plow through. Switching between modes takes about 30 seconds.

6-Position Height Adjustment – Single-lever adjustment lets you change cutting height from roughly 1.5 to 4 inches. That’s enough range to handle everything from a tight 2-inch cut in summer to a taller 3.5-inch setting for drought stress. The lever is on the rear wheel—easy to reach while mowing, though not as convenient as some side-mounted designs.

Easy Start System – PowerSmart uses a primer bulb and automatic choke mechanism to reduce pull-start effort. In practice, it usually starts within 1-2 pulls on cold starts, and often on the first pull when warm. It’s not as effortless as electric start, but it’s noticeably easier than many budget mowers.

Pros

• Excellent hill performance for the price – The rear-wheel drive gives you genuine climbing ability that rivals mowers costing $100+ more.
• Durable steel deck – Holds up to years of use without warping or cracking, unlike plastic decks on comparably priced mowers.
• Genuinely easy to start – Most users report first or second pull starts, even after winter storage (with proper fuel care).
• Versatile 3-in-1 system – Switching between mulching, bagging, and discharge is simple, and all components are included.
• Light enough to push manually – When the self-propel is off, this mower is manageable for flat sections or tight maneuvering.
• Solid warranty and parts availability – PowerSmart offers a 2-year warranty and replacement parts are easy to find online, which isn’t always true for budget brands.

Cons

• Self-propel speed isn’t infinitely adjustable – You get a handful of fixed speeds, and the fastest setting may feel too slow for flat, open lawns.
• Plastic wheels feel a bit cheap – They’re functional but not as robust as ball-bearing wheels on premium mowers. Over time, the hubs can wear on rough ground.
• Bagging capacity is average – The 1.5-bushel bag fills quickly in thick grass, especially if you’re not mulching. You’ll make frequent trips to the compost pile.
• No electric start option – If you have arthritis or really hate pulling cords, you’ll need to look at models with battery-powered starting.

Bottom Line

The PowerSmart 21" Gas Self-Propelled Lawn Mower is a smart buy for homeowners who need reliable hill-climbing power on a medium lawn without spending $500+. The rear-wheel drive and steel deck deliver where it counts, and the easy-start system removes the biggest frustration of gas mowers. It’s not a luxury machine—the wheels feel budget-grade and the bag is small—but for the price, it punches well above its weight. If you’re maintaining a sloped quarter-acre and want to avoid the premium markups of Honda or Toro, this is the mower to get.

Frequently Asked Questions

Does this mower require oil and gas to be mixed?
No. The 170cc OHV engine uses straight unleaded gasoline (87 octane or higher) and has a separate oil sump. You’ll need to add SAE 30 or 10W-30 oil before first use—check the dipstick before every mow.

Will this mower handle thick, wet grass without clogging?
Generally yes, but use the side discharge for heavy or wet conditions. The mulching function works best on dry grass cut regularly. If you let the lawn get overgrown, expect clogs under the deck—this is true of nearly all mowers in this class.

How do I adjust the self-propel speed?
There’s a lever on the handlebar with 3-4 preset positions. Squeeze the drive bail to engage, then move the lever to your desired speed. You can’t fine-tune it mid-mow—you have to stop or at least release the bail to adjust.