Top 10 Best mower engine in 2026

Last Updated - 6/8/2026

🏆Best Choice

STP

STP Premium Small Engine 4 Cycle Oil Formula, SAE10W-30 Small Engine Oil Engine Care Formula Reduces Wear for Lawnmower, Push Mower, Tractor, 32 Oz, STP

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•SAE 10W-30 MOTOR OIL FOR SMALL ENGINES: One 32 fl oz bottle of STP Premium Synthetic Blend 4 Cycle Small Engine Oil SAE 10W-30, formulated for small engines in lawnmowers, generators, tractors, snow blowers, and other outdoor power equipment
•ALL-WEATHER FORMULA: This 4 cycle engine oil is a synthetic blend with an all-weather formula that promotes easier starts all year and can be used in all seasons
•FIGHTS THERMAL BREAKDOWN: Antioxidants fight thermal breakdown to enhance oil durability, helping the SAE 10W-30 oil handle high temperatures without losing its effectiveness
•REDUCES ENGINE WEAR AND OIL CONSUMPTION: Anti-Wear Technology minimizes engine wear, while the viscosity index improver helps reduce oil consumption and provides consistent lubrication at a wide range of temperatures
•PREVENTS BUILDUP: Detergents help keep small engine components clean and control carbon deposits, preventing buildup that can affect performance and start-up
•PROTECTS AGAINST CORROSION: Corrosion inhibitor promotes equipment longevity during seasonal storage, helping your engine stay protected even when not in use
•HOW TO USE: Use it as a lawnmower oil, generator oil, or for other small engines commonly used outdoors; simply check the oil and change as necessary (refer to owner’s manual

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$8.42

$14.66

-43%

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KT Deals

4 Sizes Petrol Fuel Gas Line Pipe Hose Tubing For String Trimmer Chainsaw Blower Lawn Mower and other Power Tools For 2 Cycle Small Engine Poulan, Craftman and more (Yellow 4PC)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•4 Different Size Fuel Line Hose - I.D x O.D: 0.08" x 0.14" (2mm x 3.5mm), 1/8" x 1/4" (3mm x6mm),1/8" x 3/16"(3mm x5mm),3/32" x 3/16" (2.5mm x5mm)
•4 Feet Long Fuel Line Fuel Hose Fuel Tube
•Our Fuel Hose Line Tube Fits for Most 2 Cycle Small Engines
•Perfect Replacement Fuel Line Set for chainsaws, blowers, weedeater whackers trimmers and other engine machines
•Premium Material petrol fuel line - Oil and gas resistant, corrosion resistant.

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$7.99

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PowerSmart

PowerSmart 21-Inch Gas Lawn Mower with B&S Engine, 3-in-1 (Bag/Mulch/Rear Discharge), Self-Propelled, 6 Cutting Heights, Durable Steel Deck, Rear-Wheel Drive

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•POWERED BY A RELIABLE B&S ENGINE: Equipped with a powerful 140cc B&S engine, known for its smooth start-up, consistent performance, and long-term durability—ideal for tough mowing jobs.
•21-INCH CUTTING WIDTH FOR HIGH EFFICIENCY: The robust steel deck covers a wide 21-inch path, reducing mowing time and making it perfect for medium to large yards.
•3-IN-1 FUNCTION: BAGGING, MULCHING & REAR DISCHARGE: Switch easily between modes: collect clippings in the 1.4-bushel bag, mulch to nourish your lawn, or rear-discharge for quick and efficient mowing.
•6-POSITION HEIGHT ADJUSTMENT: Quickly adjust the cutting height from 1.5"" to 3.9"" with a single lever to match grass length, season, or preferred lawn look.
•SELF-PROPELLED WITH LARGE REAR WHEELS: Rear-wheel drive and 10"" large rear wheels offer excellent traction and maneuverability on slopes or uneven terrain.

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$297.00

$419.99

-29%

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Oregon

Oregon Small Engine Deck Leveling Gauge, Correct Unlevel Mower Blades & Deck to Ensure Longevity, Safety & Performance, Universal Fit For Both Riding and Push Lawn Mowers, Lawn Mower Parts (42-095)

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•𝗢𝗥𝗘𝗚𝗢𝗡 𝗟𝗔𝗪𝗡 𝗠𝗢𝗪𝗘𝗥 𝗗𝗘𝗖𝗞 𝗟𝗘𝗩𝗘𝗥 𝗧𝗢𝗢𝗟: Designed to help accurately measure and adjust the cutting height of mower decks, to improve mowing quality for a cleaner cut
•𝗘𝗫𝗧𝗘𝗡𝗗 𝗧𝗛𝗘 𝗟𝗜𝗙𝗘 𝗢𝗙 𝗬𝗢𝗨𝗥 𝗟𝗔𝗪𝗡 𝗠𝗢𝗪𝗘𝗥: Ensuring the blades and deck are level helps reduce wear and tear, promoting proper alignment
•𝗛𝗜𝗚𝗛 𝗣𝗘𝗥𝗙𝗢𝗥𝗠𝗔𝗡𝗖𝗘: Our deck leveling gauge provides uniform grass cutting, better lawn health and improved lawn mowing efficiency
•𝗘𝗔𝗦𝗬 𝗧𝗢 𝗨𝗦𝗘: Best used on a flat surface, ensure the mower is turned off and always check your mower manual for manufacturer’s recommended blade height settings
•𝗢𝗥𝗘𝗚𝗢𝗡 𝗤𝗨𝗔𝗟𝗜𝗧𝗬: Designed and engineered in the USA with high-quality materials by experts for reliable professional performance every time

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$12.64

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BILT HARD

BILT HARD Gas Engine Vertical Shaft, 173cc 4.4 HP 4-Stroke Gas Motor, Replacement Engine for Lawn Mower, EPA & CARB Compliant

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Unleash Dynamic Energy - Embrace the strength of a 173cc displacement 4-stroke vertical cylinder gas engine, boasting remarkable torque of 6.64 ft.lbs @2500 RPM. Capable of reaching a maximum speed of 3600 RPM, it's equipped with a staggering 4.4 maximum horsepower, all fueled by a 0.26-gallon tank.
•Precision Shaft Specifications - Dive into the specifics of our engine with a 7/8-inch diameter shaft measuring 3.16 inches in length. The end is meticulously tapped with 3/8-inch - 24 UNF threads, further enhanced by a 3/16-inch keyway. The mounting pattern spans 8 inches, while the engine features a 3/8"-24 UNF tapped hole and a 0.079 x 0.34-inch through-hole.
•Safety at the Forefront - Safety is paramount, evident in the built-in Force Air-Cooled, Splash Lubrication System, and Low oil shutoff function. Our engine spark plug system accommodates RA6HC/DCPR7E/DK7PTC spark plugs, offering a clearance of 0.027-0.031 inches. This engine is the perfect replacement for your lawnmower, ensuring a blend of power and security.
•Vital Note - Kindly note that our engine is shipped dry to ensure freshness. Before starting, be sure to add gasoline and engine oil correctly (please note, oil is not included).
•Certified Excellence - EPA and CARB Compliant. Our gas engine meets the highest standards of quality and compliance, proudly bearing both EPA and CARB certifications. Rest assured, each engine undergoes Oil Testing before packaging, so it may have a slight oily touch, signifying its 100% new condition.

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$209.99

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Briggs & Stratton

Briggs and Stratton Vertical 17.5 HP 500cc INTEK Engine 9amp 1" x 3-5/32" #31R977-0054

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Cast iron cylinder sleeve and dual element air filter for extended engine life
•Patented linear balancing system provides smoother performance
•9 amp/electric start only
•1" x 3-5/32" shaft, tapped 7/16" with 1/4" keyway
•Common riding mower replacement engine

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$709.00

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Aceup Energy

Aceup Energy Gas Engine Vertical Shaft, 4.4HP 173cc 4-Stroke OHV Gas Motor with Primer for Lawn Mower, EPA Compliant

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Shaft 7/8" diameter ,3.16" long, end tapped with 3/8"- 24 UNF; Keyway 3/16"
•Small gas engine motor with recoil start, enrichment pump drive with primer
•4.4HP 3600RPM, 4 stroke air cooled OHV with recoil start, 0.9 gallon fuel tank
•Equipped with metal cams, forged crankshafts and cast iron cylinder liners to ensure superior performance and longer service life
•All our engines tested in the factory to guarantee quality; EPA compliant; Backed by a 1 year limited warranty with free lifetime technical guidance from experts

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$149.99

$159.90

-6%

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Briggs & Stratton

Briggs & Stratton Vertical Engine 19 HP 540cc 1''x3-5/32'' #33S877-0043, Black

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Cast iron cylinder sleeve and dual element air filter for extended engine life
•Patented linear balancing system provides smoother performance
•9 amp/electric start only. Includes muffler.
•1" x 3-5/32" shaft, tapped 7/16" with 1/4" keyway
•Common riding mower replacement engine

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$789.00

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Kawasaki

24hp Vertical 1"x3-5/32" Shaft, Fuel Pump, Electric Start, Kawasaki Engine

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•24hp Kawasaki 726cc OHV V-Twin Engine
•1" x 3-5/32" shaft, tapped 7/16" with 1/4" keyway.
•Common replacement engine for consumer riding mowers and z-turns
•Please measure your old engine crankshaft, as Kawasaki makes 1 x 3-5/32, 1-1/8 x 3-5/32, 1-1/8 x 3.94, 1-1/8 x 4-5/16

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$1874.99

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Briggs & Stratton

Briggs and Stratton 49T877 Commercial Turf Series 27 Gross HP 810cc V-Twin with Cyclonic Air Filter and 1-1/8-Inch by 4-5/16

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•49T877-0035 replaces 49T877-0025
•1-1/8" x 4-5/16" shaft, tapped 7/16" with 1/4" keyway
•27 HP 810cc Professional Series Engine
•Common replacement engine for consumer riding mowers and z-turns. Seperate control control for choke-throttle.
•Please measure your old engine crankshaft, as Briggs makes 1 x 3-5/32, 1-1/8 x 3-5/32, 1-1/8 x 3.94, 1-1/8 x 4-5/16

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$1499.95

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