AMERISUN 21" 2-in-1 Gas Push Lawn Mower, 144cc 4-Cycle OHV Engine, Mulching & Side Discharge, 6-Position Height Adjustment, Lightweight Walk-Behind Mower for Small to Medium Yards Review

Overview

The AMERISUN 21" 2-in-1 Gas Push Lawn Mower is a budget-friendly, lightweight walk-behind mower packing a 144cc OHV engine and a 21-inch steel deck. It’s designed for homeowners with small to medium yards (up to about 1/3 acre) who want a simple, no-fuss gas mower that mulches and side-discharges without the complexity or cost of a self-propelled system. Think of it as the reliable, no-surprises workhorse for the weekend mower.

Who Should Buy This

1. Homeowners with 1/4 to 1/3 acre flat lots – If your yard is small enough that you don’t need self-propulsion, this mower’s lightweight design (around 60 lbs) makes it easy to push and maneuver around flower beds and fences.

2. Budget-conscious buyers upgrading from a corded electric – At $309, it’s cheaper than most gas mowers with similar specs, and you get the freedom of gas power without tripping over extension cords.

3. Mulching enthusiasts who hate bagging – The 2-in-1 system prioritizes mulching, with a deep deck design that chops clippings fine. If you want to feed your lawn naturally, this mower delivers.

4. First-time gas mower owners – Simple controls, no complicated drives or cables, and a pull-start that’s forgiving for beginners. It’s a great entry point into gas mowing without the intimidation factor.

Key Features Breakdown

• 144cc 4-Cycle OHV Engine: This is a solid, no-frills powerplant. OHV (overhead valve) design means better fuel efficiency and cooler operation than older side-valve engines. It’s not a Honda, but it’s more than enough to cut thick St. Augustine or Bermuda grass without bogging down—just don’t let it get too tall.

• 21-Inch Steel Deck: A sweet spot for small to medium yards. Wide enough to cover ground quickly, narrow enough to fit through standard gates. The steel deck is durable but can rust if you leave clippings caked on—so clean it after each use.

• 2-in-1 Mulching & Side Discharge: No bag included here, but that’s intentional. The mulching system uses a curved blade and deck design to recut clippings into fine particles. Switch to side discharge (chute included) for taller grass or when you want a cleaner look. It’s a trade-off: simpler setup, but you’ll need a bag if you want to collect.

• 6-Position Height Adjustment: Single-lever adjustment with six settings from roughly 1.5 to 3.5 inches. That’s enough range for cool-season and warm-season grasses. The lever is on the rear axle, so you don’t have to bend down to each wheel—a nice ergonomic touch for the price.

• Lightweight Walk-Behind Design: At about 60 pounds, it’s one of the lightest gas mowers in this class. That makes it easy to lift into a truck bed or push up a gentle slope. But lightweight also means less traction on steep hills—you’ll feel it on inclines over 15 degrees.

Pros

1. Exceptional value for the price – Few mowers under $350 offer a 144cc OHV engine and a 21-inch steel deck. You’re getting a lot of mower for the money.

2. Easy to start and maintain – The engine fires up reliably after a few primes, even after winter storage (use fuel stabilizer). Oil changes are straightforward with a side drain plug.

3. Excellent mulching performance – The deep deck and mulching blade produce fine clippings that disappear into the lawn. No clumping, even in slightly damp grass.

4. Light and maneuverable – At 60 lbs, you can easily lift it over a curb or carry it up a set of steps. Great for yards with obstacles or uneven terrain.

5. Simple, intuitive controls – One lever for height, one for the blade engagement, and a throttle/choke combo. No confusing diagrams needed.

6. Compact storage – The handle folds down without tools, making it easy to stash in a garage corner or shed.

Cons

1. No bagging option available – This is a 2-in-1 only (mulch and side discharge). If you need to collect clippings for composting or a tidy lawn, you’ll have to buy a separate bagging kit (which AMERISUN doesn’t sell directly). Check compatibility with universal bags.

2. Not for thick, wet, or tall grass – The 144cc engine is adequate, but it will struggle if you let the grass get over 6 inches tall or if it’s soaked. You’ll need to mow frequently in peak growing season.

3. Side discharge chute is flimsy – The included plastic chute feels a bit cheap and can crack if you hit a rock or stump. Treat it gently.

4. No self-propulsion – On slopes or thick grass, you’ll be doing all the work. If your yard has any significant incline, look for a self-propelled model.

Bottom Line

The AMERISUN 21" 2-in-1 is a no-nonsense, budget-friendly gas mower that punches above its weight for small, flat lawns. It mulches beautifully, starts reliably, and won’t break your back or your wallet. The lack of a bagging option and the flimsy side chute are real limitations, but if your main goal is to mulch clippings into a healthy lawn and you don’t need self-propulsion, this is one of the best values under $350. I’d recommend it confidently to anyone with a 1/4-acre lot who wants a simple, effective gas mower without the premium price tag.

Frequently Asked Questions

Q: Can I add a grass catcher/bag to this mower? A: Officially, no—the AMERISUN is designed as a 2-in-1 only. However, some universal rear-bagging kits (like the ones from Yardworks or Craftsman) may fit if you’re handy with modifications. Your mileage will vary, so check dimensions before buying.

Q: What type of oil and fuel does it take? A: Use SAE 30 or 10W-30 engine oil (about 20 oz for the crankcase). For fuel, use regular unleaded gasoline (87 octane) with no more than 10% ethanol. Always add fuel stabilizer if you’re storing it for more than a month.

Q: How do I adjust the cutting height? A: There’s a single lever on the rear axle. Just pull it outward, move it to one of six numbered positions (1 is lowest, 6 is highest), and release. No tools