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 designed for homeowners with hilly or medium-sized lawns (up to about ½ acre). With a 170cc OHV engine, rear-wheel drive, and a durable alloy steel deck, this mower punches above its price point—especially for those who need reliable self-propulsion on slopes without shelling out for a premium brand. It’s best for DIY lawn care enthusiasts who want gas-powered performance without the sticker shock.

Who Should Buy This

• Homeowners on a slope (1/4 to 1/2 acre): The rear-wheel drive system provides excellent traction on inclines, making this a top pick for yards where push mowers leave you exhausted.
• Budget-conscious buyers who want gas power: At $375, this mower undercuts many competitors with similar specs. If you need a self-propelled gas mower but can’t justify $500+, this is your sweet spot.
• People who hate mixing oil and gas: The 170cc OHV engine runs on straight unleaded gasoline (no 2-cycle mix), and the easy-start system reduces pull-cord frustration.
• Gardeners who want versatility: The 3-in-1 capability (mulch, bag, or side discharge) lets you adapt to seasonal needs—mulch leaves in fall, bag clippings in spring, or discharge for tall grass.

Key Features Breakdown

• 170cc OHV Engine: Overhead valve design means better fuel efficiency and lower emissions than side-valve engines. It starts reliably after winter storage (use fuel stabilizer) and handles thick grass without bogging down.
• 21" Alloy Steel Deck: Steel is tougher than stamped aluminum decks found on cheaper mowers. It resists dents from rocks and roots, and the 21" width is a good balance for maneuverability in tighter spots while still covering ground quickly.
• Rear-Wheel Drive (RWD): This is crucial for hills. Front-wheel drive mowers lose traction on slopes, but RWD pushes from behind, giving you better control when climbing. The self-propel speed is adjustable via a lever.
• 6-Position Height Adjustment: Single-lever adjustment (no crawling under the deck) with cutting heights from 1.25" to 3.75". This range works for Bermuda grass (low cut) to tall fescue (higher setting).
• 3-in-1 Capability: The included mulching plug and bagger (12.5-gallon capacity) are decent for the price. Side discharge is a backup for overgrown grass. Note: the bagger fills quickly in dense, wet grass—plan to empty often.
• Easy Start System: PowerSmart’s “Easy Start” reduces pull-cord resistance. It’s not as effortless as a Honda or Toro system, but it’s noticeably better than generic Chinese engines.

Pros

1. Excellent hill performance: Rear-wheel drive and decent tire tread give you real traction on slopes up to 15 degrees.
2. Great value for the price: Comparable self-propelled mowers from big brands cost $450–$600.
3. Easy to service: The air filter and spark plug are accessible without disassembling the deck. Oil changes are straightforward.
4. Solid build for the money: The alloy steel deck feels sturdier than many plastic-housed mowers at this price.
5. Mulching is effective: In dry grass, the mulching plug produces fine clippings that disappear into the lawn.
6. Compact storage: The handle folds without tools, making it easy to stand upright in a garage corner.

Cons

1. Bagging capacity is small: The 12.5-gallon bag fills up fast—expect to empty it 3–4 times on a ¼-acre lawn with thick grass.
2. Self-propel speed range is narrow: The adjustable lever only offers 2–3 meaningful speeds. It’s fine for a steady pace, but not as customizable as premium mowers.
3. Plastic wheels feel cheap: The wheels are hard plastic with shallow tread. They work on grass but slip on wet pavement or loose dirt.
4. No washout port: You’ll need a hose and scraper to clean the deck underside—a minor annoyance, but competitors often include this feature.

Bottom Line

The PowerSmart 21" Gas Self-Propelled Lawn Mower is the right choice if you have a sloping, medium-sized lawn and want to save $100–$200 without sacrificing rear-wheel drive or cutting performance. It’s not a luxury mower—the bagger is small, the wheels are basic, and you won’t get the refinement of a Honda or Toro. But for the price, it delivers reliable starting, solid mulching, and genuine hill-climbing ability. I’d recommend it to anyone with a ¼- to ½-acre sloped yard who’s tired of pushing a manual mower uphill. Skip it if you need a huge bag capacity or have a perfectly flat lawn where a cheaper push mower would suffice.

Frequently Asked Questions

Q: Does this mower require oil and gas mixing?
A: No—it uses a standard 4-stroke engine. Fill the gas tank with regular unleaded gasoline (87 octane) and check the oil separately (SAE 30 is recommended). The oil is not mixed with fuel.

Q: How do I adjust the self-propel speed?
A: There’s a lever on the handlebar. Squeeze it to engage drive, then slide the lever up or down to change speed. It’s a friction-based system, so you’ll feel 2–3 distinct speeds rather than infinite adjustment. Start on the lower setting for thick grass or hills.

Q: Will this mower handle wet grass without clogging?
A: It handles damp grass okay with the side discharge, but mulching wet grass will clog the deck quickly. For best results, mow when grass is dry, and don’t cut more than ⅓ of the blade height at once. If you must mow wet, use the bagger and empty it frequently.