Best Side Discharge Lawn Mowers in 2026: 15 Picks Ranked by Specs
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Finding the best side discharge lawn mowers comes down to matching deck width, cutting heights, and engine displacement to your turf. This guide compares 15 models based strictly on the specifications published on their listings. The PowerSmart 18-Inch 144cc Gas Push Mower earns the top ranking because its 144cc engine and 18-inch steel deck offer dependable cutting across five height settings.
Comparing these specs helps you decide between compact push decks and wider cutting paths to suit your yard size and terrain.
Quick picks
The best fit for you
- You need a compact gas mower for small yards PowerSmart 18-Inch 144cc Gas Push Mower Its 18-inch steel deck and 144cc engine maneuver easily through smaller lawn spaces.
- You need maximum engine displacement and wide cut coverage BILT HARD 21-Inch 201cc Gas Push Mower The 201cc engine and 21-inch steel deck tackle heavy side discharge across 10 height settings.
- You want a lightweight cordless model with steel construction PowerSmart 17-Inch 40V Steel Deck Push Mower Its 40V battery, brushless motor, and 17-inch steel deck weigh just 39.7 pounds.
- You want self-propelled cordless power for large yards NovorikX 21-Inch 60V Self-Propelled Mower Two 5.0Ah 60V batteries power a self-propelled drive and 21-inch deck for larger lawns.
Our 15 picks
PowerSmart 18-Inch 144cc Gas Push Mower
Best for: small yards needing dedicated side discharge mowing
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- gas, 144cc 4-cycle
- Cutting Width
- 18 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.5-3.9 in, 5 positions
This PowerSmart walk-behind push lawn mower features an 18-inch steel deck and a 144cc 4-stroke OHV gas engine. Built specifically for dedicated side discharge mowing, it ejects clippings directly onto the lawn through tall grass. You can select from five cutting height settings ranging from 1.5 to 3.9 inches. At 58.4 pounds with 8-inch rear and 7-inch front wheels, it suits you if you maintain small yards and prefer a compact gas-powered machine.
Pros
- 144cc 4-stroke OHV engine with auto choke and primer
- Durable 18-inch steel deck
- 5-position cutting height adjustment from 1.5 to 3.9 inches
- Dedicated side discharge setup for managing tall grass
- 8-inch rear and 7-inch front wheels for tight turns
Cons
- Single-function side discharge without bagging or mulching capability
- Manual push drive lacks self-propelled assistance
- Narrower 18-inch cutting width covers less lawn per pass than 20- or 21-inch models
Good fit if
- You want a dedicated side discharge mower for small yards.
- You prefer a compact 18-inch steel deck that maneuvers easily around garden beds.
- You need cutting heights between 1.5 and 3.9 inches across five adjustments.
Skip if
- You need grass collection bagging or mulching modes.
- You prefer a self-propelled drive mechanism over a manual push setup.
- You want a deck wider than 18 inches to mow large lawns faster.
Verdict: PowerSmart 18-Inch Gas Push Mower delivers reliable side discharge cutting with a 144cc engine and an 18-inch steel deck. It provides five height settings and straightforward push operation for managing smaller turf areas.
BILT HARD 21-Inch 201cc Gas Push Mower
Best for: heavy side discharge cutting with gas torque
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- 201cc 4-stroke gas
- Cutting Width
- 21 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.2-3.75 in, 10 positions
This gas walk-behind mower pairs a 21-inch steel cutting deck with a 201cc 4-stroke OHV engine producing 9.0 ft.lb of torque. For side discharge setups, it gives you a broad cutting path alongside 3-in-1 mulching and bagging options. Single-lever height adjustment spans 10 settings from 1.2 to 3.75 inches. It suits you if you maintain larger yards and want high engine displacement.
Pros
- 201cc 4-stroke OHV engine delivers 9.0 ft.lb of torque
- 21-inch steel deck supports side discharge, mulching, and rear bagging
- Single-lever height adjustment with 10 positions from 1.2 to 3.75 inches
- Large 9.5-inch rear and 8-inch front double ball-bearing wheels
Cons
- Manual push drive system lacks self-propel assistance
- Total weight is 73.8 pounds
Good fit if
- You need a wide 21-inch cutting deck with side discharge capability.
- You want high engine torque from a 201cc 4-stroke gas motor.
- You prefer single-lever adjustment across 10 distinct cutting heights.
Skip if
- You need a self-propelled drive system to reduce pushing effort.
- You prefer a battery-powered mower to avoid gas engine maintenance.
Verdict: BILT HARD 21-Inch 201cc Gas Push Mower provides substantial gas torque and a wide 21-inch steel deck for side discharge work. It offers durable construction and 10 height settings if you do not require self-propelled drive.
PowerSmart 21-Inch 144cc Gas Push Mower
Best for: wide-path side-discharge mowing on uneven lawns
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas, 144cc 4-cycle OHV
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This push mower pairs a 144cc 4-cycle OHV gas engine with a 21-inch steel deck. It offers side-discharge and mulching options, alongside a 6-position single lever adjusting cut height between 1.5 and 3.9 inches. At 59.4 pounds with 10-inch rear wheels and a foldable handle, it suits you if you want a wide cutting swath and straightforward side discharge without battery maintenance.
Pros
- 21-inch steel deck with mulching and side discharge
- Single-lever height adjustment across 6 positions (1.5 to 3.9 inches)
- 10-inch rear wheels and 7-inch front wheels
- Foldable handle saves up to 70% storage space
Cons
- No collection bag included for rear bagging
- Push drive requires manual effort on slopes
- Gas engine requires fuel and oil maintenance
Good fit if
- You need a 21-inch cutting deck for wide side-discharge passes.
- You prefer single-lever height adjustment from 1.5 to 3.9 inches.
- You want 10-inch rear wheels for maneuvering over uneven ground.
Skip if
- You want a self-propelled drive system instead of manual pushing.
- You need a grass-bagging option to collect clippings.
- You prefer a battery-powered electric motor over gas power.
Verdict: PowerSmart 21-Inch Gas Push Lawn Mower delivers a wide steel deck and 6-position single-lever height control for dedicated side-discharge or mulching tasks. Its manual push drive and gas engine keep operation simple if you do not need grass collection.
SENIX 20-Inch 144cc Gas Push Mower
Best for: basic side-discharge mowing on level lawns
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas, 144cc 4-cycle OHV
- Cutting Width
- 20 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.25-3.75 in, 5 positions
This gas push mower features a 144cc 4-cycle OHV engine and a 20-inch steel cutting deck dedicated to side discharge. You get five cutting height positions ranging from 1.25 inches to 3.75 inches, along with 7-inch front and rear wheels. Weighing 43.4 pounds, this walk-behind model suits you if you need a straightforward, steel-deck gas machine for managing standard yards and slopes up to 15 degrees without collecting clippings.
Pros
- 20-inch steel cutting deck
- 144cc 4-cycle OHV gas engine
- 5-position cutting height adjustment from 1.25 to 3.75 inches
- Lightweight push design at 43.4 pounds
- Two-year limited warranty
Cons
- Manual push drive without self-propulsion
- Side discharge only with no bagging capability listed
- Standard 7-inch rear wheels instead of high wheels
Good fit if
- You want a dedicated side-discharge mower with a 20-inch steel deck.
- You prefer a manual push gas mower that weighs under 45 pounds.
- You cut lawn turf between 1.25 inches and 3.75 inches.
Skip if
- You need a self-propelled drive system for easier operation.
- You want grass collection or bagging functionality.
- You need larger rear wheels for uneven, deep terrain.
Verdict: SENIX 20-Inch 144cc Gas Push Mower delivers straightforward side-discharge mowing with a durable steel deck and five height settings. Its 43.4-pound weight makes it easy to maneuver across lawns without relying on powered drive wheels.
PowerSmart 17-Inch 40V Steel Deck Push Mower
Best for: small lawns needing cordless side discharge
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- 40V battery
- Cutting Width
- 17 in
- Voltage
- 40V
- Battery Capacity
- 4.0Ah
- Deck Material
- steel
View on Amazon: PowerSmart 17-Inch 40V Steel Deck Push Mower
This PowerSmart cordless mower features a 17-inch steel deck with 3-in-1 capability, including side discharge, mulching, and bagging. Powered by a 40V 4.0Ah battery and a brushless motor, it handles yards up to 1/8 acre on a single charge. If you want a lightweight 39.7-pound push mower that clears clippings via side discharge without handling gas or cords, this compact battery model fits smaller residential lawns.
Pros
- 3-in-1 mowing system supports side discharge, mulching, and bagging
- Brushless motor paired with a steel cutting deck
- Lightweight 39.7-pound design for straightforward pushing
- Includes a 40V 4.0Ah battery and charger
Cons
- 17-inch cutting path is narrower than standard 20-inch or 21-inch decks
- Coverage limited to approximately 1/8 acre per charge
- Manual push drive provides no mechanical assistance on slopes
Good fit if
- You maintain a residential yard up to 1/8 acre in size.
- You want a lightweight mower with side discharge capability.
- You prefer battery operation over gas engine maintenance.
Skip if
- You need to cut lawns significantly larger than 1/8 acre.
- You require a wider 20-inch or 21-inch cutting deck.
- You prefer a self-propelled drive system.
Verdict: PowerSmart 40V 17-Inch Cordless Lawn Mower delivers compact 3-in-1 cutting with a durable steel deck and side discharge utility. It gives you quiet battery operation without the bulk or upkeep of gas alternatives.
SENIX 21-Inch 144cc Push Gas Lawn Mower
Best for: wide-path push mowing on uneven yards
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas, 144cc 4-cycle
- Cutting Width
- 21 in
- Drive Type
- Push
- Cutting Height
- 1.25-3.75 in, 6 positions
- Application
- Yard, Garden, Lawn
This push mower pairs a 144cc 4-cycle gas engine with a 21-inch cutting deck for wide-path clearing. It features 2-in-1 capability with side discharge and mulching modes, letting you manage lawn clippings directly on your turf. The 8-inch front and 11-inch rear high wheels aid movement across rough patches, while a 6-position height lever adjusts cut depth between 1.25 and 3.75 inches. It suits yards needing broad gas-powered cutting.
Pros
- 21-inch cutting deck cuts wide passes per lap
- 11-inch rear and 8-inch front wheels navigate uneven ground
- 6 cutting height settings ranging from 1.25 to 3.75 inches
- 4-cycle 144cc engine runs without mixing oil and gas
Cons
- Manual push drive system lacks self-propelled assist
- 2-in-1 configuration lacks a rear collection bag
Good fit if
- You want a wide 21-inch cut with side discharge and mulching options.
- You manage uneven turf that benefits from taller 11-inch rear wheels.
- You prefer a 4-cycle gas engine that avoids fuel mixing.
Skip if
- You require a self-propelled drive system to reduce pushing effort.
- You prefer collecting clippings in a rear grass catcher bag.
Verdict: SENIX 21-Inch 144cc Gas Push Mower delivers a wide cut path and high rear wheels for straightforward push mowing across uneven yards. Its 2-in-1 deck provides dedicated side discharge and mulching without the need to mix engine fuel.
PowerSmart 18-Inch Steel Deck Gas Push Mower
Best for: mowing smaller yards with tight spaces
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- gas, 144cc 4-stroke OHV
- Cutting Width
- 18 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.5-3.9 in, 5 positions
View on Amazon: PowerSmart 18-Inch Steel Deck Gas Push Mower
This PowerSmart walk-behind push mower features a compact 18-inch steel deck and a dedicated side discharge setup. Powered by a 144cc 4-stroke OHV gas engine with an auto choke, it clears clippings directly onto your lawn without bagging attachments. Dual levers provide five cutting heights from 1.5 to 3.9 inches. If you maintain smaller yards and want a narrower footprint that maneuvers easily around tight borders, this push model fits your routine.
Pros
- 18-inch durable steel cutting deck
- 144cc 4-stroke OHV engine with auto choke
- 5-position dual-lever height adjustment from 1.5 to 3.9 inches
- 8-inch rear and 7-inch front wheels for easier pushing
Cons
- Side discharge only with no mulching or bagging options listed
- Manual push drive without self-propelled assist
- Narrower 18-inch deck requires more passes than 20- or 21-inch models
Good fit if
- You need a compact 18-inch cutting deck for narrow passages or smaller yards.
- You prefer a gas-powered push mower with a steel deck and dedicated side discharge.
- You want a 5-position cutting height range between 1.5 and 3.9 inches.
Skip if
- You want a self-propelled drive system instead of a manual push mower.
- You need mulching or rear bagging capability for grass clippings.
- You have a large lawn and want a wider 20-inch or 21-inch deck.
Verdict: PowerSmart 18-Inch Gas Push Mower provides straightforward side-discharge mowing with a durable steel deck and a 144cc gas engine. It is a practical, maneuverable choice for maintaining smaller yards with tight spaces.
Baococo 20-Inch 144cc Gas Push Mower
Best for: small flat yards needing side discharge
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas, 144cc 4-stroke
- Cutting Width
- 20 in
- Drive Type
- Push
- Deck Material
- Steel
- Application
- Yard, Small Yards
This gas push mower gives you a 20-inch steel cutting deck paired with a 144cc 4-stroke engine. Built for basic lawn maintenance, it features 2-in-1 capability supporting side discharge and mulching. At 49.8 pounds with 7-inch wheels all around, it remains lightweight and straightforward to push across flat terrain. If you manage a small yard and need dedicated side discharge without complex drive systems, this configuration covers your core mowing tasks.
Pros
- 20-inch steel cutting deck
- 144cc 4-stroke single-cylinder engine
- 2-in-1 mowing functions for side discharge and mulching
- Weighs 49.8 pounds for manageable manual pushing
Cons
- No collection bag included for grass bagging
- Manual push drive lacks self-propelled assist
- 7-inch rear wheels offer limited clearance on uneven ground
Good fit if
- You maintain a small lawn and rely on side discharge or mulching.
- You want a gas mower under 50 pounds without drive assemblies to maintain.
- You prefer simple pull-start 4-stroke operation without mixing fuel.
Skip if
- You need to bag clippings rather than discharge or mulch them.
- You require self-propelled drive assistance for steep slopes.
Verdict: Baococo 20-Inch 144cc Gas Push Mower provides basic side discharge and mulching via a 20-inch steel deck and pull-start engine. It serves as a straightforward manual push tool tailored for small lawns.
PowerSmart 21-Inch 140cc Gas Push Mower
Best for: yards needing wide side-discharge push mowing
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas, 140cc 4-stroke
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This push mower pairs a 21-inch steel cutting deck with a 140cc Briggs and Stratton four-stroke engine. Built for flexibility, it offers side discharge, rear bagging, and mulching capabilities. You can select from six cutting heights between 1.5 and 3.9 inches to match your turf conditions. It suits you if you need wide cutting coverage with dedicated side discharge disposal on lawns where manual push propulsion works well.
Pros
- 21-inch steel cutting deck covers wide paths
- 140cc Briggs and Stratton four-stroke engine requires no fuel mixing
- Three-in-one functionality supports side discharge, bagging, and mulching
- Six height adjustments ranging from 1.5 to 3.9 inches
Cons
- Manual push drive provides no mechanical propulsion
- Gas engine requires fuel upkeep rather than clean battery operation
Good fit if
- You want a wide 21-inch steel deck for side discharging clippings.
- You prefer a four-stroke gas engine that does not require mixing oil and gas.
- You need cutting heights adjustable across six settings up to 3.9 inches.
Skip if
- You want a self-propelled drive system to reduce mowing fatigue.
- You prefer a battery-powered mower with zero engine emissions.
Verdict: PowerSmart 21-Inch 140cc Gas Push Mower delivers wide cutting coverage and flexible side discharge via a reliable four-stroke engine. It provides solid steel construction and multi-mode clipping management for manual yard care.
DOWILIN 20-Inch 144cc Gas Push Mower
Best for: small flat yards needing lightweight side discharge
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- 144cc 4-stroke gas engine
- Cutting Width
- 20 in
- Drive Type
- push
- Deck Material
- steel
- Application
- Yard, Small Yards
The DOWILIN 20-Inch 144cc Gas Push Mower provides basic turf maintenance for small yards. You get a 144cc 4-stroke engine paired with a 20-inch steel deck. Its 2-in-1 design handles side discharge for taller growth and mulching for lawn feeding. At 49.8 pounds with 7-inch wheels, you push it manually without self-propelled assist. It suits you if you need a straightforward, lightweight gas mower without bagging hardware.
Pros
- 20-inch steel cutting deck
- 144cc 4-stroke pull-start engine
- Lightweight 49.8-pound push frame
- 2-in-1 side discharge and mulching capability
Cons
- Manual push drive without self-propulsion
- No grass bagger option included
- 7-inch rear wheels lack high-wheel rough-terrain clearance
Good fit if
- You need a lightweight gas mower weighing under 50 pounds.
- You maintain a small yard using side discharge or mulching.
- You prefer a durable steel cutting deck with a 20-inch width.
Skip if
- You need a collection bag for gathering lawn clippings.
- You want self-propelled drive assistance for sloped terrain.
- You prefer an electric start system instead of a manual pull cord.
Verdict: DOWILIN 20-Inch 144cc Gas Push Mower delivers straightforward side discharge and mulching in a compact 49.8-pound build. Its 20-inch steel deck and 144cc engine suit routine maintenance on flat, small yards.
NovorikX 21-Inch 60V Self-Propelled Mower
Best for: cordless side discharge on larger lawns
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- 60V battery
- Cutting Width
- 21 in
- Voltage
- 60V
- Drive Type
- self-propelled
- Battery Capacity
- 2 x 5.0Ah
This 21-inch cordless mower runs on a 60V platform powered by two included 5.0Ah batteries and a 1200W brushless motor. You get 3-in-1 cutting capability, including side discharge for managing tall grass without bagging. Its variable-speed self-propelled drive operates between 0.9 and 3.6 mph. Built with a steel deck and rated for up to 1 acre, it suits you if you need cordless operation across medium to large lawns.
Pros
- Two 60V 5.0Ah lithium-ion batteries included
- Variable-speed self-propelled drive from 0.9 to 3.6 mph
- 1200W brushless motor with a 21-inch steel deck
- 3-in-1 functionality supports side discharge, mulching, and bagging
Cons
- Heavier total weight at 86 pounds
- Wide profile takes up storage space at 47.2 inches wide
Good fit if
- You want cordless side discharge cutting with dual 5.0Ah batteries.
- You need a variable-speed self-propelled drive to assist on lawns up to 1 acre.
Skip if
- You want a lightweight mower that weighs under 86 pounds.
- You prefer a push-only mower without battery drive components.
Verdict: NovorikX 21-Inch 60V Self-Propelled Mower pairs a 1200W brushless motor with two 5.0Ah batteries for clean side discharge mowing. Its variable-speed steel build gives you dependable battery performance on yards up to one acre.
PowerSmart 21-Inch 125cc Push Lawn Mower
Best for: medium yards needing side discharge and mulching
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- B&S 125cc 4-stroke OHV engine
- Cutting Width
- 21 in
- Drive Type
- push
- Cutting Height
- 1.5-3.9 in, 6 positions
- Application
- Yard, Garden, Lawn
This PowerSmart lawn mower combines a 21-inch cutting deck with a 125cc Briggs & Stratton 4-stroke engine. It offers 2-in-1 capability with side discharge and mulching modes to handle your grass clippings. You can adjust the cutting height across six positions from 1.5 to 3.9 inches. At 62 pounds, this push mower provides a wide cutting path without excess bulk if you maintain a standard yard or garden.
Pros
- 21-inch cutting deck covers wide paths
- 125cc 4-stroke OHV Briggs & Stratton engine
- 6-position cutting height adjustment from 1.5 to 3.9 inches
- 2-in-1 mowing options for side discharge and mulching
Cons
- Push drive without self-propelled assist
- No rear grass collection bag included
Good fit if
- You want a 21-inch cutting deck that supports side discharge and mulching.
- You prefer a manual push mower powered by a 125cc 4-stroke engine.
- You need six height positions ranging from 1.5 to 3.9 inches.
Skip if
- You need a grass bagger for clipping collection.
- You require self-propelled drive for sloped yards.
Verdict: PowerSmart 21-Inch 125cc Push Lawn Mower delivers a wide 21-inch cut with reliable 125cc Briggs & Stratton power and flexible side discharge. It is a solid choice if you want straightforward mulching and side ejection without extra bagging hardware.
SENIX 21-Inch Gas Push Lawn Mower
Best for: uneven lawns needing wide side-discharge mowing
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- gas
- Cutting Width
- 21 in
- Drive Type
- push
- Cutting Height
- 1.25-3.75 in, 6 positions
- Application
- Yard, Garden, Lawn
This SENIX 21-inch push mower runs on a 144cc 4-cycle gas engine and provides both side discharge and mulching functions. Its 21-inch deck cuts a wide path, while the 8-inch front and 11-inch rear wheels help you steer across uneven ground. With six cut heights from 1.25 to 3.75 inches, it suits you if you need wide side-discharge mowing without bagger maintenance.
Pros
- 21-inch cutting deck covers wide paths per pass
- 11-inch rear wheels paired with 8-inch front wheels improve traction on rough terrain
- 6 cutting height settings ranging from 1.25 to 3.75 inches
- 2-in-1 deck setup offers side discharge and mulching modes
Cons
- Lacks grass collection bagging capability
- Manual push drive provides no self-propelled assistance
- Requires assembly before first use
Good fit if
- You want a wide 21-inch cutting path with side discharge and mulching options.
- You push across uneven ground and need high 11-inch rear wheels.
- You prefer a 144cc 4-cycle gas engine without oil-and-fuel mixing.
Skip if
- You need a grass bagger to collect lawn clippings.
- You want a self-propelled drive system for easier operation on slopes.
- You prefer a battery cordless mower instead of a gas engine.
Verdict: SENIX 21-Inch Gas Push Lawn Mower pairs a 144cc engine with high rear wheels and a broad 21-inch cutting deck for straightforward side discharge. It gives you dependable gas cutting coverage across uneven terrain if you do not need collection bagging.
PowerSmart 21-Inch 125cc Gas Push Mower
Best for: wide side-discharge mowing with zero assembly
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- Gas
- Cutting Width
- 21 in
- Drive Type
- Push
- Deck Material
- Steel
- Cutting Height
- 1.5-3.9 in, 6 positions
This PowerSmart push mower pairs a 21-inch steel deck with a 125cc Briggs and Stratton E300 engine. It offers 2-in-1 capability for side discharge and mulching across 6 cutting heights from 1.5 to 3.9 inches. Weighing 56.4 pounds, it ships fully assembled and folds for storage. It suits you if you need a wide, manual-push gas mower that handles regular side-discharge mowing without bag handling.
Pros
- 21-inch 15-gauge stamped steel deck
- 125cc Briggs and Stratton E300 engine
- 6 cutting positions from 1.5 to 3.9 inches via dual levers
- Fully assembled in box with folding handle
Cons
- Push drive requires manual propulsion
- No bagging mode (mulch and side discharge only)
- Smaller 125cc displacement compared to 144cc options
Good fit if
- You want a 21-inch side-discharge mower with a Briggs and Stratton engine.
- You prefer a machine that ships fully assembled without required tools.
- You cut between 1.5 and 3.9 inches using dual-lever height adjusters.
Skip if
- You need a self-propelled drive mechanism.
- You want a rear grass collection bag.
Verdict: PowerSmart 21-Inch 125cc Gas Push Mower delivers wide 21-inch side-discharge cutting with a Briggs and Stratton engine. It provides straightforward manual operation and tool-free setup.
SENIX 20-Inch 125cc Gas Push Lawn Mower
Best for: small to medium side-discharge mowing
- Mowing Function
- Side Discharge (what this guide is about)
- Power Source
- gas
- Cutting Width
- 20 in
- Drive Type
- push
- Deck Material
- steel
- Cutting Height
- 1.25-3.75 in, 5 positions
The SENIX 20-Inch 125cc Gas Push Lawn Mower is a walk-behind mower built for small to medium yards. It features a 20-inch steel deck with a dedicated side discharge chute to disperse clippings across your lawn. Power comes from a 125 cc Briggs & Stratton 4-cycle engine. Weighing 49 pounds, it offers a 5-position cutting height between 1.25 and 3.75 inches for straightforward turf maintenance.
Pros
- 20-inch steel cutting deck with side discharge chute
- 125 cc 4-cycle Briggs & Stratton engine with Prime n Pull start
- 5-position cutting height range from 1.25 to 3.75 inches
- Lightweight 49-pound build with folding handle for compact storage
Cons
- Side discharge only with no mulching or bagging capability
- Manual push drive without self-propelled assist
- Requires 4-point adjustment at individual wheels rather than a single lever
Good fit if
- You want a dedicated side-discharge gas mower for small to medium lawns.
- You prefer a lighter 49-pound steel deck mower that is easy to push.
- You need a folding handle to save space in storage.
Skip if
- You want to mulch or bag your grass clippings.
- You need a self-propelled drive system for slopes or uneven terrain.
- You prefer single-lever cutting height adjustment.
Verdict: SENIX 20-Inch 125cc Gas Push Lawn Mower delivers dedicated side discharge cutting with a reliable Briggs & Stratton engine and durable steel deck. It provides simple, lightweight operation if you do not need mulching or bagging functions.
Specifications side by side
| Spec | PowerSmart 18-Inch 144cc Gas Push Mower | BILT HARD 21-Inch 201cc Gas Push Mower | PowerSmart 21-Inch 144cc Gas Push Mower | SENIX 20-Inch 144cc Gas Push Mower | PowerSmart 17-Inch 40V Steel Deck Push Mower | SENIX 21-Inch 144cc Push Gas Lawn Mower | PowerSmart 18-Inch Steel Deck Gas Push Mower | Baococo 20-Inch 144cc Gas Push Mower | PowerSmart 21-Inch 140cc Gas Push Mower | DOWILIN 20-Inch 144cc Gas Push Mower | NovorikX 21-Inch 60V Self-Propelled Mower | PowerSmart 21-Inch 125cc Push Lawn Mower | SENIX 21-Inch Gas Push Lawn Mower | PowerSmart 21-Inch 125cc Gas Push Mower | SENIX 20-Inch 125cc Gas Push Lawn Mower |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Power Source | gas, 144cc 4-cycle | 201cc 4-stroke gas | Gas, 144cc 4-cycle OHV | Gas, 144cc 4-cycle OHV | 40V battery | Gas, 144cc 4-cycle | gas, 144cc 4-stroke OHV | Gas, 144cc 4-stroke | Gas, 140cc 4-stroke | 144cc 4-stroke gas engine | 60V battery | B&S 125cc 4-stroke OHV engine | gas | Gas | gas |
| Cutting Width | 18 in | 21 in | 21 in | 20 in | 17 in | 21 in | 18 in | 20 in | 21 in | 20 in | 21 in | 21 in | 21 in | 21 in | 20 in |
| Voltage | not specified | not specified | not specified | not specified | 40V | not specified | not specified | not specified | not specified | not specified | 60V | not specified | not specified | not specified | not specified |
| Drive Type | push | push | Push | Push | not specified | Push | push | Push | Push | push | self-propelled | push | push | Push | push |
| Battery Capacity | not specified | not specified | not specified | not specified | 4.0Ah | not specified | not specified | not specified | not specified | not specified | 2 x 5.0Ah | not specified | not specified | not specified | not specified |
| Deck Material | steel | steel | Steel | Steel | steel | not specified | steel | Steel | Steel | steel | steel | not specified | not specified | Steel | steel |
| Cutting Height | 1.5-3.9 in, 5 positions | 1.2-3.75 in, 10 positions | 1.5-3.9 in, 6 positions | 1.25-3.75 in, 5 positions | 1.5-3.9 in | 1.25-3.75 in, 6 positions | 1.5-3.9 in, 5 positions | not specified | 1.5-3.9 in, 6 positions | not specified | not specified | 1.5-3.9 in, 6 positions | 1.25-3.75 in, 6 positions | 1.5-3.9 in, 6 positions | 1.25-3.75 in, 5 positions |
| Mowing Function | side discharge | 3-in-1 mulch, bag, side discharge | 2-in-1: mulch, side discharge | Side discharge | 3-in-1: mulch, bag, side discharge | 2-in-1: mulch, side discharge | side discharge | 2-in-1 (side discharge/mulch) | 3-in-1: side discharge, bag, mulch | 2-in-1, side discharge/mulch | 3-in-1 | 2-in-1 mulch, side discharge | mulch, side discharge | 2-in-1 | side discharge |
| Motor Type | not specified | not specified | not specified | not specified | brushless | not specified | not specified | not specified | not specified | not specified | brushless | not specified | not specified | not specified | not specified |
| Application | Yard, Small Yards, Lawn | Lawn | Lawn | Yard, Garden, Lawn | Lawn | Yard, Garden, Lawn | Yard, Small Yards, Lawn | Yard, Small Yards | Lawn | Yard, Small Yards | Lawn | Yard, Garden, Lawn | Yard, Garden, Lawn | Lawn | Lawn |
| Size | 18 Inch-144cc-5 Heights | 21 Inch | 21 Inch | 20 Inch-144cc-5 Position | 17" Mower (4.0Ah) | 21 Inch-144cc Gas Mower | 18 Inch | not specified | not specified | not specified | not specified | 21in/2-IN-1 125cc Push (Discharging/Mulching) | 21inch | 21"-125cc-6 Points | 20 inch 125 cc |
| Engine Brand | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Briggs | not specified | not specified | not specified | not specified | Briggs | Briggs |
| Dimensions | 27.2 × 14.3 × 20.1 inches | 62.5 × 26.3 × 41 inches | 56 × 22 × 42 inches | 27.2 × 22.2 × 14.2 inches | 56 × 36.6 × 18.9 inches | 32.8 × 22.7 × 14.8 inches | 58 × 20 × 48 inches | 57.4 × 21.6 × 38.5 inches | 32.9 × 16.5 × 22.6 inches | 57.4 × 21.6 × 38.5 inches | 57.1 × 47.2 × 25.6 inches | 32.9 × 16.5 × 22.6 inches | 32.3 × 22.6 × 14.8 inches | 56.5 × 22 × 40.5 inches | 26.5 × 21.7 × 14 inches |
| Weight | 58.4 pounds | 73.8 pounds | 59.4 pounds | 43.4 pounds | 39.7 pounds | 45 pounds | 59 pounds | 49.8 pounds | not specified | 49.8 pounds | 86 pounds | 28.1 pounds | not specified | 56.4 pounds | 49 pounds |
| Color | red | Blue | Red | Blue | Black & Red | Blue | red | Red | Black | Blue | 2*5.0ah | Night Black | Blue | Black | BLACK+BLUE |
| Model | DB8618C | 773e7abd-ce4a-48e9-8545-2424d5e0183b | DV8621C | GCJ-LSPG-L5 | MB2417A | LSPG-L6-001 | DB8618C | YYJ078LM51C4 | B8621P | YYJ078LM51C4B | BLM160H-21SP | B8721C | LSPG-L6 | B8721C | LSPG-L3 |
Is Side Discharge Worth It for Your Lawn?
Side discharge expels cut grass clippings directly onto your lawn surface through an open chute. This setup eliminates the need to attach, carry, or empty a collection bag while you mow. Models with dedicated side discharge or 2-in-1 side discharge and mulching systems focus strictly on dispersing turf debris. Because clippings exit the deck immediately, you bypass clipping collection entirely. This setup keeps the machine simple during routine yard upkeep, but it leaves all cut grass distributed along your mowing path.
Worth it if
- You want to mow without stopping to empty or carry grass collection bags.
- You prefer ejecting clippings directly across your lawn rather than storing them on the machine.
Skip it if
- You need a collection bag to gather clippings from your turf.
- You prefer bagging cut material to keep your lawn surface completely clear of debris.
How We Picked These Mowers
You find mowers here that explicitly state side discharge in their Amazon title or feature list. We do not physically handle or test the machines. Every detail comes directly from published specifications. To keep your choices distinct, you see only one size or variant of each product family across 15 models for 2026.
We order the list with products in stock first, then by Amazon sales rank, placing better-selling products first. Availability updates live on the page. This spec-focused layout helps you evaluate key specs like deck width, power source, and machine weight to pick the right side discharge mower for your yard.
Choosing Your Next Side Discharge Mower
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Compare Power Source Options
You must decide between a gas engine and a cordless electric platform. Gas models provide continuous cutting without recharging breaks, using engine sizes between 125cc and 201cc. Cordless options eliminate gas maintenance and pull cords, relying instead on lithium batteries. If you choose electric power, check the voltage and amp-hour specs to ensure sufficient energy for your lawn size. The PowerSmart MB2417A offers a 40V cordless setup with a 4.0 Ah battery, whereas gas models require checking fuel capacity and oil levels.
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Select Deck Cutting Width
Cutting width determines how many passes you take across your yard. Listed models range from compact 17-inch decks up to wide 21-inch steel decks. A narrower deck navigates tight passages, garden borders, and narrow gates easily. A wider deck covers open lawn areas with fewer passes, saving you mowing time on broad spaces. For example, the SENIX GCJ-LSPG-L5 features a 20-inch cutting width, balancing mid-sized coverage with manageable clearance. Review your yard layout to balance gate clearance against total mowing path width.
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Evaluate Height Adjustment Range
Check the number of height settings before choosing a mower. Height adjustment options allow you to adapt your cut to seasonal grass growth and uneven ground. Some models provide five or six fixed settings, while others feature up to ten increments. More settings give you greater precision when setting your target turf height throughout the growing season. The BILT HARD 21-Inch mower provides ten height settings, offering the highest level of fine-tuning on this list. Choose higher setting counts if your turf requires precise height adjustments.
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Review Gas Engine Displacement
If you pick a gas model, inspect the engine displacement measured in cubic centimeters. Engine sizes in this category range from 125cc and 140cc up to 144cc and 201cc. Lower displacement engines, such as the 125cc Briggs & Stratton motor on the SENIX LSPG-L3, consume less fuel and suit routine cuts on standard turf. Larger displacements provide additional power to push through thick or tall grass without bogging down. Match your lawn density to displacement so you do not underpower your side discharge cuts.
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Verify Multi-Mode Cutting Functions
Consider whether you want dedicated side discharge or multi-function cutting modes. Dedicated units eject clippings strictly through the side chute, keeping internal deck design simple. Multi-mode units offer 2-in-1 or 3-in-1 utility, letting you close the discharge port to mulch clippings back into the turf when desired. The PowerSmart DV8621C includes both mulching and side discharge functions, giving you options across dry and wet seasons. Choose a multi-mode deck if you plan to mulch fine clippings during dry summer periods instead of discharging rows.
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Check Battery Voltage Ratings
When buying cordless equipment, look closely at operating voltage and battery capacity. Voltage indicates the electric potential delivered to the brushless motor, while amp-hours dictate how long the mower operates. Listed electric mowers offer systems ranging from 40V up to 60V. High voltage platforms provide extra torque for handling taller turf, while dual battery configurations extend running capability. The NovorikX BLM160H-21SP uses a 60V platform with two 5.0Ah battery packs to sustain cutting performance. Select higher voltage if your property features dense grass that strains smaller electric motors.
Frequently asked questions
What cutting deck sizes are available on side discharge mowers?
Deck sizes on this list range from 17 inches up to 21 inches. A narrower 17-inch deck, such as on the PowerSmart MB2417A, fits tighter yard spaces. Broader 21-inch decks, seen on models from BILT HARD, SENIX, and PowerSmart, cover more turf per pass to speed up cutting on larger lawn areas.
Do side discharge mowers support mulching functionality?
Several side discharge mowers include mulching capabilities. The SENIX 21-Inch LSPG-L6-001 features a 2-in-1 cutting deck configured for both side discharge and mulching. Similarly, models like the Baococo 20-Inch and DOWILIN 20-Inch handle both ejection and mulching tasks, allowing you to choose how your clippings return to the turf.
How many cutting height adjustments do these side discharge mowers offer?
Cutting height adjustment options vary from 5 to 10 positions depending on the mower. Models such as the PowerSmart DB8618C and SENIX GCJ-LSPG-L5 provide 5 height settings. The PowerSmart DV8621C offers a 6-position single lever, while the BILT HARD 21-Inch mower provides 10 distinct height settings for precise lawn trimming.
Which side discharge lawn mowers use Briggs and Stratton engines?
Multiple models specify Briggs & Stratton engines directly in their specifications. The SENIX 20-Inch LSPG-L3 runs a 125cc Briggs & Stratton engine on a steel deck. PowerSmart also equips select 21-inch mowers with Briggs powerplants, including the 140cc B8621P model and the 125cc B8721C push model.
How much do push-type side discharge mowers weigh?
Push-type side discharge mowers on this list range from 28.1 pounds to 73.8 pounds. The lightest gas option is the SENIX 20-Inch at 43.4 pounds, followed by the Baococo and DOWILIN models at 49.8 pounds. The heaviest manual push model listed is the BILT HARD 21-Inch at 73.8 pounds.
Can you get a cordless side discharge mower with a brushless motor?
Yes, cordless models in this lineup utilize brushless motors. The PowerSmart MB2417A pairs a brushless motor with a 40V 4.0Ah battery system and a 17-inch steel cutting deck. For higher capacity, the NovorikX BLM160H-21SP uses a 1200W brushless motor powered by two 60V 5.0Ah lithium battery packs.
Are steel decks standard across side discharge mowers?
Steel decks appear across both gas and battery-powered side discharge options in this guide. The PowerSmart 40V model uses a steel deck despite its cordless build, while gas units like the PowerSmart DB8618C and SENIX GCJ-LSPG-L5 rely on steel decks for durability across routine mowing sessions.