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You need the best 140cc lawn mowers for reliable power in medium to large yards. We compared 5 models using only the specifications published on the listings. Our top pick is the PowerSmart 21-Inch 140cc Gas Push Mower, which leads due to its durable steel deck and versatile 3-in-1 mowing functions. Each option here targets specific needs, from self-propelled traction on slopes to side discharge efficiency. This guide helps you decide which machine fits your yard size and terrain. You can compare cutting widths, drive types, and engine specs to find the right fit for your routine.
Match Drive Type to Your Slope
The most critical spec is drive type. Push mowers suit flat yards, while self-propelled models handle slopes. Most picks offer 140cc engines, but cutting widths vary between 21 and 22 inches. Choose a self-propelled unit if your yard has inclines. This feature reduces physical effort significantly during mowing.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | PowerSmart 21-Inch 140cc Gas Push Mower Best overall | medium lawns needing durable push mowing | |
| 2 | PowerSmart 22-Inch 140cc Self-Propelled Gas Mower Best premium | medium to large lawns on slopes | |
| 3 | PowerSmart 21-Inch 140cc Self-Propelled Gas Mower Best budget | Sloped lawns needing reliable rear-wheel drive traction | |
| 4 | PowerSmart 21-Inch Gas Push Lawn Mower Best cordless | Flat lawns and easy storage | |
| 5 | SENIX 21-Inch Gas Self-Propelled Mower Best side discharge | small to medium yards with side discharge needs |
The best fit for you
- You need a durable mower for medium lawns – PowerSmart 21-Inch 140cc Gas Push Mower – It features a sturdy steel deck and a 140cc engine for reliable performance.
- You mow medium to large lawns on slopes – PowerSmart 22-Inch 140cc Self-Propelled Gas Mower – The self-propelled drive and 22-inch cutting width handle slopes efficiently.
- You need reliable traction for sloped yards – PowerSmart 21-Inch 140cc Self-Propelled Gas Mower – Rear-wheel drive provides traction, and the Briggs and Stratton engine ensures durability.
- You value easy storage for flat lawns – PowerSmart 21-Inch Gas Push Lawn Mower – Its compact folded dimensions and durable steel deck suit flat yard storage.
- You need versatile discharge options for small yards – SENIX 21-Inch Gas Self-Propelled Mower – It offers mulching, bagging, and side discharge with a lightweight 55-pound design.
Is a 140cc engine worth it for your yard?
A 140cc displacement indicates a robust engine capable of handling thick grass and varied terrain. In this list, every model uses this engine size, providing consistent power for medium to large yards. You will notice the difference in how the mower cuts through dense patches without stalling. Self-propelled versions leverage this torque to maintain speed on slopes, while push models offer sufficient power for flat, manageable lawns. The 140cc spec ensures you have enough reserve power for demanding mowing tasks.
Worth it if
- You have medium to large lawns with thick grass
- You need reliable power for sloped terrain
- You want a durable engine for long-term use
Skip it if
- You only have a small, flat lawn
- You prefer lightweight, easy-to-store equipment
- You are looking for ultra-quiet electric operation
PowerSmart 21-Inch 140cc Gas Push Mower
Best for: medium lawns needing durable push mowing
- Engine Displacement
- 140cc
- Cutting Width
- 21"
- Drive Type
- Push, rear-wheel drive
- Mowing Functions
- 3-in-1 (rear bag, mulch, rear discharge)
- Motor Type
- 140cc OHV
- Height Adjustments
- 6-position (1.5" – 3.9")
This PowerSmart push mower features a 140cc OHV engine and a 21-inch steel deck. It offers three-in-one cutting modes for bagging, mulching, or rear discharge. The rear-wheel drive and 10-inch rear wheels help with traction on slopes. You can adjust the cutting height from 1.5 to 3.9 inches using a single lever. This model suits users who need a durable, manual push mower for medium-sized lawns.
- 140cc OHV engine provides reliable power for thick grass
- 21-inch steel deck covers more ground per pass
- Rear-wheel drive improves traction on rough terrain
- Three-in-one functions allow bagging, mulching, or discharge
- Six-position height adjustment ranges from 1.5 to 3.9 inches
- Push design requires more physical effort than self-propelled models
- 10-inch rear wheels may struggle on very soft or uneven ground
- Steel deck adds weight compared to lighter composite alternatives
- You prefer a push mower for better maneuverability in tight spaces
- You want to mulch, bag, or discharge grass clippings
- You have a flat to moderately sloped lawn
- You need self-propelled drive for steep hills
- You want to avoid the physical effort of pushing
- You prefer a lighter mower for easy storage
Verdict: PowerSmart 21-Inch 140cc Gas Mower is a sturdy option for homeowners who want a durable steel deck and reliable engine power. It fits users who do not mind pushing the mower and want versatile cutting options.
PowerSmart 22-Inch 140cc Self-Propelled Gas Mower
Best for: medium to large lawns on slopes
- Engine Displacement
- 140cc
- Cutting Width
- 22-Inch
- Drive Type
- Self-Propelled
- Mowing Functions
- 3-in-1
- Motor Type
- 140cc Briggs and Stratton E550 Engine
- Height Adjustments
- 6-position, 1.5in. to 3.9 in.
This PowerSmart mower features a 22-inch cutting width and a 140cc Briggs and Stratton E550 engine. It uses rear-wheel drive self-propelled technology for traction on slopes. The 3-in-1 system offers mulching, side-discharging, or rear bagging with a 1.4-bushel bag. Six height positions range from 1.5 to 3.9 inches. It suits users needing a wider cut and self-propelled ease for uneven terrain.
- 22-inch cutting width for faster coverage
- 140cc Briggs and Stratton E550 engine
- Rear-wheel drive self-propelled system
- 3-in-1 mulching, discharge, and bagging
- 6-position height adjustment from 1.5 to 3.9 inches
- Heavier build at 72 pounds compared to 21-inch push models
- Single lever height adjustment mechanism
- 72-pound weight requires more effort to maneuver
- You need a wider 22-inch cut for efficiency
- You mow on slopes requiring self-propelled traction
- You want mulching, side-discharge, or bagging options
- You prefer a lighter push mower under 70 pounds
- You only need a 21-inch cutting width
- You want independent height levers for each wheel
Verdict: PowerSmart 22-Inch 140cc Self-Propelled fits homeowners with medium to large lawns who need the efficiency of a wider deck and self-propelled drive for slopes.
PowerSmart 21-Inch 140cc Self-Propelled Gas Mower
Best for: Sloped lawns needing reliable rear-wheel drive traction
- Engine Displacement
- 140cc
- Cutting Width
- 21 in.
- Drive Type
- Self-propelled
- Mowing Functions
- 2-in-1 (mulching, bagging)
- Motor Type
- 140cc Briggs and Stratton E550
- Height Adjustments
- 6 positions (1.5" to 3.9")
This PowerSmart mower features a 140cc Briggs and Stratton E550 engine and a 21-inch steel deck. It offers self-propelled rear-wheel drive for easier handling on slopes. The 1.4-bushel bag collects clippings effectively. You get six height positions ranging from 1.5 to 3.9 inches. It is a solid option for standard lawns where you want reliable power without the complexity of a 3-in-1 system.
- 140cc Briggs and Stratton E550 engine for reliable power
- Self-propelled rear-wheel drive improves traction on inclines
- 1.4-bushel rear bag offers good collection capacity
- Six height positions from 1.5 to 3.9 inches
- Single-lever height adjustment for quick changes
- Limited to 2-in-1 mulching and bagging functions
- Weighs 70 pounds, which is heavier than some competitors
- 1.4-bushel bag is smaller than the 1.8-bushel bags found on other 21-inch models in this guide
- You need self-propelled power for uneven terrain
- You prefer a simpler 2-in-1 mowing system
- You want a Briggs and Stratton engine for reliability
- You require a 3-in-1 side discharge option
- You want a lighter mower for easy storage
- You prefer a larger grass collection bag
Verdict: PowerSmart 21-inch 140cc Self-Propelled Mower suits homeowners who need reliable rear-wheel drive traction for sloped yards. It is ideal for those who value the durability of a Briggs and Stratton engine over having a side-discharge feature.
PowerSmart 21-Inch Gas Push Lawn Mower
Best for: Flat lawns and easy storage
- Engine Displacement
- 140cc
- Cutting Width
- 21"
- Drive Type
- Push
- Mowing Functions
- 3-in-1 (mulch, rear discharge, bag)
- Motor Type
- 140cc Briggs and Stratton E550
- Height Adjustments
- 6-position
This PowerSmart mower features a 140cc Briggs and Stratton E550 engine and a 21-inch steel deck. It operates as a push model with a 6-position height adjustment. The unit includes a 1.4-bushel bag and weighs 63 pounds. It suits you if you want reliable power and easy storage via its foldable design. The 3-in-1 function allows mulching, bagging, or rear discharge.
- 140cc Briggs and Stratton E550 engine for reliable power
- 21-inch steel deck for durability
- 6-position rear wheel height adjustment
- Foldable design for compact storage
- 1.4-bushel grass bag capacity
- Push drive type requires more physical effort than self-propelled models
- 63-pound weight is heavier than lighter competitors
- 1.4-bushel bag capacity is smaller than larger bags
- You prefer a push mower for smaller, flat lawns
- You need a foldable design for easy garage storage
- You want a steel deck for long-term durability
- You need self-propelled drive for hilly terrain
- You prefer a lighter mower under 60 pounds
- You require a larger grass bag than 1.4 bushels
Verdict: PowerSmart 21-Inch 140cc Push Mower fits you if you value a durable steel deck and easy storage. It is a solid choice for flat yards where you do not mind pushing the machine.
SENIX 21-Inch Gas Self-Propelled Mower
Best for: small to medium yards with side discharge needs
- Engine Displacement
- 140cc
- Cutting Width
- 21-inch
- Drive Type
- Self-propelled
- Mowing Functions
- 3-in-1 (mulching, discharge, bagging)
- Motor Type
- 140 cc 4-Cycle Briggs & Stratton
- Height Adjustments
- 6-position (1.25-inch to 3.75-inch)
This SENIX mower features a 140 cc Briggs & Stratton engine and a 21-inch cutting width. It is a self-propelled unit with front-wheel drive, weighing 55 pounds. The 3-in-1 steel deck supports mulching, side discharge, and rear bagging with a 16-gallon bagger. You get six height adjustments from 1.25 to 3.75 inches. The 8-inch front and 11-inch rear wheels aid maneuverability. It suits small to medium yards.
- 140 cc Briggs & Stratton 4-cycle engine
- 21-inch steel cutting deck
- 3-in-1 mulching, side discharge, and bagging
- 6-position height adjustment (1.25 to 3.75 inches)
- Includes 16-gallon rear bagger
- 55-pound weight is heavier than comparable 21-inch models
- Single-speed front-wheel drive offers less traction control than rear-wheel drive
- 21-inch cutting width is narrower than 22-inch competitors
- You need a self-propelled mower for small to medium yards
- You want a reliable Briggs & Stratton engine with easy Prime N' Pull starting
- You prefer side discharge or bagging over mulching
- You require rear-wheel drive for steep or slippery terrain
- You want a wider 22-inch cutting deck for faster coverage
- You need variable speed control for precise pacing
Verdict: SENIX 21-Inch 140cc Self-Propelled Mower is a solid option for homeowners who prioritize a trusted Briggs & Stratton engine and versatile discharge options. It fits users who do not need variable speed or rear-wheel drive traction.
Specifications side by side
| Spec | PowerSmart 21-Inch 140cc Gas Push Mower | PowerSmart 22-Inch 140cc Self-Propelled Gas Mower | PowerSmart 21-Inch 140cc Self-Propelled Gas Mower | PowerSmart 21-Inch Gas Push Lawn Mower | SENIX 21-Inch Gas Self-Propelled Mower |
|---|---|---|---|---|---|
| Cutting Width | 21" | 22-Inch | 21 in. | 21" | 21-inch |
| Drive Type | Push, rear-wheel drive | Self-Propelled | Self-propelled | Push | Self-propelled |
| Mowing Functions | 3-in-1 (rear bag, mulch, rear discharge) | 3-in-1 | 2-in-1 (mulching, bagging) | 3-in-1 (mulch, rear discharge, bag) | 3-in-1 (mulching, discharge, bagging) |
| Motor Type | 140cc OHV | 140cc Briggs and Stratton E550 Engine | 140cc Briggs and Stratton E550 | 140cc Briggs and Stratton E550 | 140 cc 4-Cycle Briggs & Stratton |
| Height Adjustments | 6-position (1.5" – 3.9") | 6-position, 1.5in. to 3.9 in. | 6 positions (1.5" to 3.9") | 6-position | 6-position (1.25-inch to 3.75-inch) |
| Power Type | Gas | Gas | Gas | Cordless | Gas |
| Engine Displacement | 140cc | 140cc | 140cc | 140cc | 140cc |
| Dimensions | 32.9 × 16.5 × 22.6 inches | 56.5 × 22 × 40.5 inches | 60.2 × 22.6 × 37.8 inches | 32 × 16 × 22 inches | 33 × 23 × 16 inches |
| Weight | – | 72 pounds | 70 pounds | 63 pounds | 55 pounds |
| Size | 21-Inch | 22 Inch-140cc | 144cc & 2-in-1 | – | 21-inch |
| Color | Black+R | Red | Red | Bright red | Blue |
| Model | B8721S2 | HB8622S | B8721S1 | B8721P | LSSG-M9 |
How We Selected These 140cc Mowers
We identified each mower by checking the title and feature list for an engine displacement of 140cc. This specific cubic centimeter rating ensures consistent power output for standard residential tasks. Only one size or variant from each product family was included to keep the list focused and comparable. All details are drawn directly from the published specifications on the Amazon listings.
The products are ordered by availability first, then by the listing's overall rating weighted by the number of ratings. Finally, we ranked them by how many of our core criteria the specs meet. This method highlights models that balance engine power with practical features like cutting width and drive type. We did not physically handle these units, relying solely on the data provided by the manufacturers.
How to choose the right 140cc mower
Match cutting width to yard size
Cutting width determines how many passes you need to clear your lawn. Wider decks cover more ground per stroke, reducing mowing time. Most models in this guide offer 21-inch decks, which are versatile for average yards. The PowerSmart 22-Inch Self-Propelled model provides a wider 22-inch cut, helping you finish larger areas faster. Select a 21-inch width if you navigate tight spaces between trees or garden beds. Choose 22 inches if you prioritize speed over maneuverability in tight corners. Your yard layout should dictate this choice.
Select drive type for your terrain
Drive type affects how much physical effort you expend while mowing. Push mowers require you to provide all the forward motion, making them suitable for flat, even lawns. The PowerSmart 21-Inch Gas Push Mower is a sturdy option for these conditions. Self-propelled models move forward on their own, reducing fatigue on slopes or uneven ground. The PowerSmart 22-Inch Self-Propelled model handles medium to large lawns on slopes efficiently. If your yard has significant inclines, a self-propelled drive is essential for control and ease.
Choose mowing functions for grass disposal
Mowing functions define how clippings are handled after cutting. Three-in-one systems typically offer mulching, bagging, and side discharge options for maximum versatility. The PowerSmart 21-Inch Gas Push Mower includes these three functions. Some models, like the SENIX 21-Inch Self-Propelled Mower, explicitly list side discharge capabilities. If you prefer to collect clippings in a bag, ensure the model supports bagging. For those who leave clippings to decompose, verify mulching capability. Check the attribute list to confirm which disposal methods are supported.
Check weight for storage and handling
Weight impacts how easy the mower is to lift into a garage or move around obstacles. Lighter units are easier to store and maneuver. The SENIX 21-Inch Gas Self-Propelled Mower weighs 55 pounds, making it one of the lighter options here. Heavier models, like the PowerSmart 22-Inch Self-Propelled at 72 pounds, may offer more durability but require more effort to lift. Consider your storage space and physical strength. If you need to carry the mower up stairs, a lower weight is preferable. Use the spec sheet to compare poundage across models.
Verify engine brand for reliability
Engine brand often correlates with long-term reliability and parts availability. Some models use Briggs & Stratton engines, known for durability. The PowerSmart 21-Inch Self-Propelled Mower features a Briggs & Stratton engine, which may appeal to users prioritizing trusted components. Other models may use generic or different branded engines. If you plan to keep the mower for many years, check the engine manufacturer listed in the attributes. A reputable engine brand can simplify maintenance and repairs. Compare engine details to ensure you get the reliability you expect.
Frequently asked questions
Is a 140cc engine powerful enough for my lawn?
Yes, a 140cc engine provides robust power suitable for medium to large residential yards. This displacement handles thick grass and varied terrain effectively. All models in this guide feature this engine size, ensuring consistent performance for standard mowing tasks without straining the motor.
Should I choose a push or self-propelled mower?
Choose a push mower for flat lawns where you prefer manual control. Select a self-propelled model for slopes or larger areas to reduce physical effort. Self-propelled units offer rear-wheel drive traction for stability on uneven ground, while push models are lighter and easier to store.
What is the difference between 21-inch and 22-inch cutting decks?
A 22-inch deck covers more ground per pass than a 21-inch deck, reducing total mowing time. Most models here offer 21-inch widths for versatility. The wider 22-inch option is ideal for larger yards where efficiency matters more than maneuverability in tight spaces.
Do these mowers support mulching, bagging, and side discharge?
Many models offer 3-in-1 functions, including mulching, bagging, and side discharge. Some units focus on specific tasks, such as rear-wheel drive traction or side discharge only. Check the attributes list to confirm which discharge options your chosen model supports for your yard cleanup preferences.
How heavy are these gas lawn mowers?
Weight varies by model and drive type. Self-propelled units typically weigh between 55 and 72 pounds due to added drive mechanisms. Push mowers are generally lighter, around 63 pounds. Heavier units offer more stability, while lighter ones are easier to lift and store.
Which mower is best for sloped yards?
Self-propelled models are best for slopes due to their drive systems. The PowerSmart 22-Inch Self-Propelled and the SENIX 21-Inch Self-Propelled offer traction for inclines. These units help you maintain control and safety on uneven terrain without the physical strain of pushing a heavy mower.
