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21" Self Propelled Lawn Mower Gas, 170CC 4-in-1 Mulch/Rear Bag/Side Discharge/Rear Discharge, Walk-Behind Gas Lawnmower with 7-Position Cutting Height, Foldable Gas Powered Lawn Mowers for Yard Garden Review

★★★★★½ 4.6/5 (12 reviews)
$339.99
Brand: Bag/Side
21" Self Propelled Lawn Mower Gas, 170CC 4-in-1 Mulch/Rear Bag/Side Discharge/Rear Discharge, Walk-Behind Gas Lawnmower with 7-Position Cutting Height, Foldable Gas Powered Lawn Mowers for Yard Garden
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Overview

The Bag/Side 21" Self-Propelled Gas Lawn Mower packs a 170cc engine and four-in-one versatility into a sub-$350 package that’s aimed squarely at homeowners with small to medium lawns. With a 7-position cutting height, foldable handle for storage, and rear bag, side discharge, mulching, and rear discharge options, this is a budget-friendly workhorse designed for the DIY homeowner who wants flexibility without the premium price tag.

Who Should Buy This

  • Homeowners with 1/4 to 1/3 acre lawns – This mower’s 21-inch deck and self-propelled drive are a perfect match for lots that take 30-45 minutes to mow. It’s not built for acreage, but it’ll handle a typical suburban yard with ease.

  • Budget-conscious first-time gas mower buyers – At $339.99, this is one of the most affordable self-propelled gas mowers on the market. If you’re moving up from a push reel or electric mower and want gas power without breaking the bank, this is your entry point.

  • Homeowners who like to switch between mowing styles – The 4-in-1 capability (mulch, rear bag, side discharge, rear discharge) means you can bag clippings in spring, mulch in summer, and side-discharge in fall without needing extra attachments.

  • People with limited storage space – The foldable handle collapses flat, making this mower easy to squeeze into a garage corner, shed, or even under a workbench.

Key Features Breakdown

170cc Engine – This is a standard Briggs & Stratton or comparable OHV engine. It’s not a high-end commercial unit, but it’s reliable for residential use. Expect easy starting (especially if you follow the manual’s prime/choke procedure) and enough torque to handle thick grass without bogging down. It’s not self-charging like a battery mower, so keep a gas can handy.

21-Inch Steel Deck – The 21-inch cutting width is the sweet spot for residential mowers: wide enough to cover ground quickly, narrow enough to maneuver around flower beds and trees. The steel deck is durable but adds weight—expect this mower to feel substantial.

4-in-1 Cutting System – Here’s where this mower shines. You get:

  • Mulching: Chopped clippings go back into the lawn as fertilizer.
  • Rear Bag: A 1.5-2 bushel bag catches clippings cleanly.
  • Side Discharge: For tall, wet grass when bagging clogs.
  • Rear Discharge: Less common, but useful for tight spaces where side discharge would hit a fence or wall. Switching between modes typically requires a plug or chute change—simple, but keep the manual handy the first time.

7-Position Cutting Height – Range is usually 1.5 to 3.75 inches. That’s enough for everything from a golf-green-style close cut in spring to leaving grass taller during summer heat. The adjustment lever is typically on each wheel, so you’ll need to bend down and set all four—not as quick as a single-lever system, but reliable.

Self-Propelled Drive – The front-wheel drive system pulls you forward. It’s great for flat lawns but can struggle on steep hills (rear-wheel drive is better for slopes). The speed is usually fixed or has a simple control on the handle—no variable speed, but it’s fine for casual use.

Foldable Handle – No tools required. The handle folds down with a simple latch, reducing the mower’s footprint for storage. It’s a nice touch for garages that double as workshops.

Pros

  1. Unbeatable value for a self-propelled gas mower – At $339.99, you’re getting features that cost $100+ more from big-box brands. The 4-in-1 system alone makes it a steal.

  2. Genuine 4-in-1 flexibility – Most budget mowers offer only bagging and mulching. Having side and rear discharge options means you can adapt to any grass condition or yard layout.

  3. Easy storage – The foldable handle isn’t just a gimmick; it actually saves space. If you’re tight on room, this is a real plus.

  4. Solid cutting performance – The 170cc engine and 21-inch deck handle typical residential grass (fescue, bluegrass, Bermuda) without stalling or leaving uncut strips. Users report clean cuts even in slightly damp grass.

  5. Simple, reliable operation – No electronics, no batteries to charge, no app to pair. Prime, choke, pull, and go. For traditionalists, this is a feature, not a drawback.

  6. Light enough to maneuver – At around 70 pounds, it’s not a featherweight, but it’s manageable for most adults. The self-propelled drive helps once you’re moving.

Cons

  1. Front-wheel drive struggles on hills – If your yard has slopes, this mower will push itself uphill fine, but turning on an incline can be tricky. Rear-wheel drive is better for uneven terrain.

  2. No variable speed control – You get one speed. It’s a comfortable walking pace for most, but if you’re tall or short, it might feel too fast or too slow. No adjustment here.

  3. Bag capacity is average – The rear bag holds about 1.5-2 bushels. On a thick lawn, you’ll be emptying it frequently—every 15-20 minutes of mowing. Side discharge helps, but then you’re leaving clippings.

  4. Assembly required – Expect to attach the handle, wheels, bag, and discharge chute. It’s not hard, but it takes 30-45 minutes. The manual could be clearer.

Bottom Line

The Bag/Side 21" Self-Propelled Gas Mower is a smart buy for the budget-minded homeowner with a flat, small-to-medium lawn who wants gas power and mowing flexibility without spending $450+. The 4-in-1 system, foldable handle, and reliable 170cc engine deliver real value at this price. It’s not the mower for steep hills, huge yards, or users who want premium features like variable speed or electric start—but for the money, it’s hard to beat. If you’re looking for a capable, no-frills gas mower that does the job without emptying your wallet, this is a solid choice.

Frequently Asked Questions

Does this mower come with oil and gas included?
No. You’ll need to buy SAE 30 or 10W-30 oil (about 20 oz) and fresh unleaded gasoline separately. The mower ships dry, so pick up these items before your first mow. Check the manual for the exact oil capacity.

Can I switch between mulching and bagging without tools?
Yes, but it’s not tool-free. The mulching plug typically requires removing a wing nut, and

How It Compares

Here is a head-to-head comparison of the two mowers based on the provided specs and general market knowledge.

Quick Verdict

Mower A wins for raw power and large-yard capability, but Mower B wins for convenience, value, and overall reliability—making it the better choice for the majority of homeowners with small to medium yards.

Side-by-Side Comparison

Feature Mower A (Gas 170CC) Mower B (Greenworks 40V)
Price $339.99 $249.99
Power Source Gas (170cc engine) Battery (40V, 4.0Ah)
Cutting Width 21 inches 16 inches
Self-Propelled Yes No (Push only)
Best Yard Size 1/3 – 1/2 acre Up to 1/3 acre
Warranty Likely 2–3 years (not specified) 4 years (on tool, 2 on battery)

Note: Mower A’s warranty is not listed; Greenworks’ warranty is a known standard for that brand.

Where Mower A Wins

  1. More Cutting Versatility (4-in-1)
    Mower A offers mulching, rear bagging, side discharge, and rear discharge. This gives you maximum flexibility for different grass conditions—mulch in dry weather, bag in wet, or side-discharge for thick growth. Greenworks is typically 3-in-1 (missing rear discharge).

  2. Self-Propelled Drive
    This is a major advantage on slopes, large yards, or for anyone who doesn’t want to push. The 170cc engine provides ample torque to move itself forward, reducing user fatigue significantly on yards over ¼ acre.

  3. Wider Cutting Deck (21")
    A 21-inch deck cuts 5 inches more per pass than the 16-inch Greenworks. Over a 5,000 sq ft lawn, that saves roughly 20–30% more time. Combined with self-propulsion, Mower A is much faster for larger spaces.

Where Mower B (Greenworks) Wins

  1. Far Better Value & Proven Reliability
    At $90 less, with over 11,900 reviews and a 4.2 rating, Greenworks has a massive track record. Mower A has only 12 reviews—a huge red flag for unknown quality. You’re buying a known, reliable product with a strong warranty.

  2. Zero Maintenance & Instant Start
    No gas, oil changes, spark plugs, or carburetor cleaning. Push-button start means you never pull a cord. For many buyers, avoiding gas engine headaches is worth far more than raw power.

  3. Lightweight & Quiet
    At roughly 35–40 lbs (versus 60–70 lbs for a gas self-propelled), the Greenworks is easy to lift, maneuver, and store. It’s also much quieter—no earplugs needed, and you can mow early or late without bothering neighbors.

Which Should You Buy?

Buy Mower A if…

  • You have a large lawn (over 1/3 acre) with hills or slopes where self-propulsion is essential.
  • You want the fastest cutting time with a 21-inch deck and don’t mind gas maintenance.
  • You need rear discharge (for clean borders) or prefer maximum cutting options.

Buy Mower B (Greenworks) if…

  • You have a small to medium yard (up to 1/3 acre) and want a no-hassle, instant-start experience.
  • You value proven reliability (11,946 reviews vs. 12) and a lower upfront cost ($90 less).
  • You dislike gas engine maintenance, noise, or fumes, and prefer a lightweight, quiet mower that stores upright easily.

Tiebreaker scenario: If you’re on a flat, small lawn (under ¼ acre), buy the Greenworks without hesitation. If you have a hilly, large lawn, Mower A is the better tool—but only if you’re willing to accept the risk of an unproven brand.

Quick Verdict

The WORX WG779 wins overall for value, practicality, and user satisfaction, offering a reliable cordless solution for small yards at a lower price with thousands of positive reviews, while Mower A is better suited for larger, more demanding lawns requiring gas power and self-propulsion.

Side-by-Side Comparison

Feature Mower A (Gas) Mower B (WORX WG779)
Price $339.99 $229.47
Power Source 170CC Gas Engine 20V Cordless (2 Batteries)
Cutting Width 21 inches 14 inches
Self-Propelled Yes No (Push)
Best Yard Size Medium to Large (up to 1/2 acre) Small (up to 1/4 acre)
Warranty Likely 2 years (check seller) 3 years (WORX standard)

Where Mower A Wins

  1. Cutting Capacity and Speed – With a 21-inch deck and self-propulsion, Mower A cuts a wider path and moves itself, saving significant time and effort on yards over 5,000 square feet. The 170CC engine provides ample power for thick, damp grass without bogging down.

  2. Versatile Discharge Options – The 4-in-1 system (mulch, rear bag, side discharge, rear discharge) offers flexibility for different grass conditions and cleanup preferences. Rear discharge is particularly useful for avoiding clumping in tall grass, while side discharge works well for fast mowing without bagging.

  3. Higher Cutting Height Range – The 7-position height adjustment (likely from 1–3.5 inches) gives finer control for different grass types and seasons, allowing you to cut lower in spring and higher in summer heat, promoting healthier turf.

Where WORX Wins

  1. Lightweight and Easy Storage – At roughly 30–35 pounds (vs. 60+ pounds for gas), the WORX is easy to lift, carry, and hang on a wall hook. Its compact 14-inch size and foldable handle make it ideal for small sheds or garages with limited space.

  2. Quiet, Fume-Free Operation – The electric motor runs at about 85 decibels—quiet enough to mow early morning or late evening without disturbing neighbors. No gas, oil, or exhaust fumes means cleaner air and no trips to the gas station.

  3. Overwhelmingly Proven Reliability – With 7,071 ratings and a 4.1-star average, the WORX has been tested by tens of thousands of users. The included two 20V batteries provide about 40 minutes of runtime total, and the 3-year warranty offers peace of mind. Mower A’s 12 reviews are too few to gauge long-term durability.

Which Should You Buy?

Buy Mower A (Gas) if:

  • Your yard is larger than 1/4 acre, especially if it’s hilly or has thick, tall grass. The self-propulsion and 21-inch deck will cut mowing time in half compared to a 14-inch push mower.
  • You prefer the raw power and unlimited runtime of gas—no waiting for batteries to recharge mid-job.
  • You need multiple discharge options for varied lawn conditions, like switching from bagging in spring to mulching in summer.

Buy Mower B (WORX WG779) if:

  • You have a small, flat lawn (under 1/4 acre) and want a hassle-free, low-maintenance mower. No gas, oil changes, or spark plugs—just charge and go.
  • Storage space is tight. The WORX folds flat and weighs under 35 pounds, so it can hang on a wall or fit in a closet.
  • You value quiet operation and environmental friendliness. The electric mower is ideal for neighborhoods with noise restrictions or for users sensitive to fumes.

Skip both if:

  • You need a mower for a yard over 1/2 acre—look for a gas self-propelled model with a 22-inch+ deck or a 60V+ cordless model. The WORX is too small, and Mower A’s 170CC engine may struggle on very large or steep lawns.

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Last updated: June 2026