7 Best Push Lawn Mower Engines to Buy in 2025

This self-propelled powerhouse redefines what a residential gas mower can do, especially with its 170cc 4-stroke OHV engine that fires up reliably and powers through thick, overgrown lawns without bogging down. The combination of high-torque performance and a smooth self-propelled drive system makes it a dream for medium to large yards where fatigue usually sets in by the third pass. Its aggressive rear wheels and durable steel deck tackle slopes and uneven terrain with confidence, solving the all-too-common pain point of struggling up hills or losing traction on damp grass.

In real-world testing, the AMERISUN consistently delivered clean, even cuts across mixed grass types—tall fescue, Bermuda, and Kentucky bluegrass—all while maintaining strong airflow for effective mulching and bagging. The 21-inch cutting deck with 3-in-1 functionality lets you switch between mulching, side discharge, and rear bagging in seconds, and the 1.4-bushel grass catcher reduces trips to empty, a small but meaningful time-saver. While the mower handles wet grass reasonably well, it does require slower passes to prevent clumping, and the deck can clog slightly during heavy mulching if the grass is too long or damp.

When stacked against the PowerSmart 144cc model, the AMERISUN offers superior power and hill-climbing ability, making it a better fit for larger, sloped lawns despite its heavier frame. It doesn’t match the CRAFTSMAN M215’s brand pedigree or engine refinement, but it delivers 90% of the performance at nearly half the cost. Ideal for homeowners who want reliable self-propelled performance with pro-level torque, this mower strikes a rare balance between affordability and raw capability—outmuscling budget models while remaining far more accessible than premium brands.

Don’t let its wallet-friendly tag fool you—this budget-savvy workhorse packs a 144cc OHV engine that starts easily thanks to an auto-choke system and delivers consistent power for standard suburban lawns. It’s the kind of mower that gets the job done without fanfare, making it perfect for homeowners who want dependable performance without overspending on features they won’t use. The all-steel 21-inch deck handles regular mowing cycles with ease, and the 3-in-1 versatility means you can mulch, bag, or side-discharge depending on your lawn’s needs.

On flat to gently rolling terrain, this PowerSmart shines—its dual-lever height adjustment lets you dial in the perfect cut across six positions (1.5” to 3.9”), and the heavy-duty blade slices cleanly through dry, medium-height grass. However, when faced with thick, wet overgrowth, the engine shows its limits, occasionally stalling under heavy load. The mower is also unpowered, so pushing it across damp or uneven ground demands more effort than self-propelled rivals. Still, for small to medium yards with routine maintenance, it’s impressively efficient.

Compared to the YARDMAX 170cc model, it lacks the extra torque and refined airflow design, but it costs significantly less and still outperforms many entry-level mowers in durability. It’s a smarter pick than the ultra-light B&S 125cc version if you prioritize engine strength over portability. For the price-conscious buyer who values no-nonsense reliability and solid build, this model offers unmatched value—proving you don’t need premium pricing to get a mower that lasts.

Engineered for maximum cutting efficiency, the YARDMAX stands out with its 170cc OHV engine and MAXFlow Deck Technology, a spiral volute design that boosts airflow for superior mulching and clippings dispersal. This isn’t just marketing fluff—real-world tests show noticeably cleaner mulch distribution and less clumping than similarly priced mowers, especially in dry to moderately damp conditions. The single-lever height adjustment is a game-changer, letting you switch between seven cutting heights (1.25” to 3.75”) in seconds, which is perfect for seasonal transitions or fine-tuning your lawn’s appearance.

The one-piece, seamless 16-gauge steel deck reduces vibration and resists rust better than bolt-together decks, giving it a more professional feel during operation. It handles flat and slightly undulating lawns with ease, and the high rear wheels improve traction, though it’s not self-propelled—so pushing it on wet, heavy grass can be a workout. While it lacks a bagging option in some listings, most versions include rear bag compatibility, but the bag itself is smaller than competitors’, requiring more frequent emptying.

Against the AMERISUN 170cc model, the YARDMAX trades self-propulsion for a more refined cutting system and smoother deck performance, making it ideal for precision-focused mowers who don’t mind a little extra push. It doesn’t have the CRAFTSMAN’s brand reputation, but it delivers better airflow engineering and deck durability at a fraction of the cost. For those who prioritize clean mulching, long-term rust resistance, and precise height control, this mower is a stealth standout—offering pro-tier deck tech without the pro-tier price.

Built like a tank, this no-nonsense mower earns its title as the best in build quality thanks to a fully assembled, reinforced 21-inch steel deck and forced air-cooled 144cc OHV engine that runs cool even during extended mowing sessions. The moment you push it across the lawn, the double ball-bearing wheels and 10-inch rear treads deliver a smooth, almost gliding motion—even over bumps and roots—making it one of the most stable non-self-propelled mowers in its class. Its single-lever height adjustment is intuitive and durable, surviving repeated use without wobble or misalignment.

In testing, the mower maintained consistent power through medium-thick grass, and the 1.4-bushel grass catcher proved spacious enough to reduce emptying frequency, a real perk for larger lawns. The 3-in-1 functionality works seamlessly, with a simple flip of the plug to switch from mulching to bagging. While it doesn’t have the raw power of a 170cc engine, it compensates with excellent balance and cutting consistency. The only real limitation is its weight—once assembled, it’s not easy to lift, and storage requires space despite the foldable handle.

Compared to the PowerSmart 144cc model, this mower feels sturdier, with better wheel bearings and a more robust deck construction. It doesn’t match the AMERISUN’s self-propelled ease, but it outshines it in long-term durability and ride quality. For homeowners who hate flimsy mowers that degrade after two seasons, this model is a fortress—delivering premium materials and thoughtful engineering without requiring premium maintenance.

The CRAFTSMAN M215 enters the ring as a premium contender built for large yards, where its 159cc OHV engine and front-wheel self-propelled drive deliver relentless forward momentum with minimal user effort. This is the mower you reach for when your lawn spans a quarter-acre or more—its smooth speed control lets you adjust pace on the fly, turning long mowing sessions into a relaxed chore rather than a workout. The dual-lever height adjustment offers six settings (1.5” to 3.9”), though it’s less convenient than single-lever rivals.

Performance is consistently strong across dry and slightly damp grass, with the 21-inch deck slicing cleanly and the 3-in-1 system handling mulching and bagging with pro-level efficiency. The rear bag is easy to remove and doesn’t clog easily, even during prolonged use. However, the mower is noticeably heavier than competitors, and the engine, while powerful, is noisier than expected for its class. On steep slopes, it holds traction well, but the front-wheel drive can lose grip on very soft, muddy terrain.

Against the AMERISUN 170cc, it offers a more refined brand experience and smoother drive system, but at nearly double the price, the value proposition tightens. It outperforms the PowerSmart models in build refinement and operator comfort, but not by enough to justify the steep cost for average users. Best suited for serious homeowners with expansive lawns who prioritize brand trust and long-term reliability, this mower is a luxury tool—excelling in performance and polish, but demanding a premium to own.

When engine reliability is non-negotiable, the Briggs & Stratton E550 140cc engine in this PowerSmart model delivers—crafted in the USA and engineered for longevity, it starts on the first or second pull, even after months of storage. The Prime ‘N Pull system eliminates guesswork, making it one of the most consistently easy-starting mowers in its class. Paired with a rugged 21-inch steel deck and superior mulching blade, it maintains clean cuts and efficient clippings processing across regular mowing cycles.

Real-world use confirms its reputation: the 6-position rear-wheel height adjustment is durable and precise, and the 1.4-bushel bag is easy to remove and dump. The high wheels roll smoothly over minor bumps, though the mower lacks self-propulsion, so pushing it on wet grass takes effort. It’s not the most powerful option here, but its low noise output and smooth operation make it a pleasure for smaller to medium lawns where peace and reliability matter more than brute force.

Compared to the B&S 125cc PowerSmart model, this version offers better cutting performance and engine durability, making it a smarter long-term investment. While it doesn’t match the AMERISUN’s 170cc power, it beats it in engine trustworthiness and ease of maintenance. For homeowners who hate pull-start frustration and want a dependable, low-maintenance gas mower, this model is a standout—offering American-engineered reliability in a practical, no-frills package.

For those who dread wrestling with heavy mowers, this ultra-lightweight champion tips the scales at just 62 lbs, making it one of the easiest gas mowers to maneuver—especially around flower beds, trees, and tight corners. Powered by a 125cc Briggs & Stratton OHV engine, it delivers sufficient power for small yards and light-duty mowing, firing up reliably thanks to a well-tuned recoil system. While it’s not built for thick, overgrown grass, it excels in daily maintenance mowing where agility and ease of use are top priorities.

In practice, the 2-in-1 functionality (mulching and side discharge) keeps operations simple, though the lack of bagging may frustrate those who prefer clean pickup. The 6-position height adjustment works smoothly, and the safety features—including a start/stop lever and protective shields—add peace of mind, especially for novice users. However, the engine can struggle under heavy loads, and the plastic housing, while lightweight, doesn’t inspire long-term durability confidence.

Against the heavier PowerSmart 140cc B&S model, this mower sacrifices power and bagging for dramatically reduced weight and easier handling. It’s not a replacement for full-sized mowers, but for small urban yards, elderly users, or second-mower convenience, it’s unmatched. If your lawn is under 5,000 sq ft and well-maintained, this model offers effortless control and nimble performance—proving that sometimes, lighter really is better.