550ex Series™

5.50 Gross Torque

Performance and value in one unbeatable package. You’ll love the smooth handling of the lightweight, yet powerful 550ex Series™ lawn mower engine. With a best-in-class torque-to-weight ratio, reduced vibration and quieter operation, you can give your lawn a class-A cut with ease. 550ex push mower engines come standard with Super Lo-Tone™ muffler and hassle-free ReadyStart® starting system.

  • See how the ReadyStart® Starting System works.

  • Avoid Lawn Mower Engine Damage

    Look Before you pump fuel into your lawn mower and help avoid engine damage. Do not use any fuel containing greater than 10 percent ethanol (E10) in the engine on your outdoor power equipment.

  • Lawn Mower Engine Torque

    Cubic centimeters (cc) only measure the size of the engine on your lawn mower or outdoor power equipment. Torque measures the power that rotates the blade. Maximize your mowing power.

  • Tool-less Air Cleaner Cover

    Easy access for filter changes

  • Have a question? Search our FAQs to find answers related to model specifications, routine maintenance, repair or troubleshooting. Search FAQs »

  • Find genuine Briggs & Stratton repair and/or maintenance parts for your engine or outdoor power equipment to ensure future performance. Purchase Parts »

Torque* 5.5
Engine Displacement (cc) 140
Number of Cylinders Single
Engine Configuration Vertical Shaft
Engine Technology OHV
Length (in) 13.8
Width (in) 12.2
Height (in) 9.6
Weight (lbs) 17
Bore (in) 2.5
Stroke (in) 1.75
Engine Fuel Gasoline
Fuel Tank Capacity (gallons) 0.2
Lubrication System Dura-Lube Splash Lubrication
Oil Capacity (oz) 15
Oil Filter No
Starter Recoil
Air Filter Oil Foam or Dual-Sealing Round Paper
Muffler Lo-Tone™ or Super Lo-Tone™
Fuel Shutoff Valve No
Certified Power Rating

*All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.

*All power levels are stated gross torque at 2600 rpm per SAE J1940 as rated by Briggs & Stratton.

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