Briggs & Stratton PXi Series™ Engines

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Our PXi Series V-Twin riding mower engines give you premium power and features to handle the big jobs. The enhanced components are extremely durable, and premium air, oil and fuel filters keep the engine running clean to extend engine life. Our optional starting technologies provide reliable, automotive-style starting in all weather conditions – from minus 20°F up to 120°F.

  • Advanced Debris Management System – Helps our engines run cleaner and longer by deflecting and ejecting grass and debris, providing a longer life.
  • Full Pressure Lubrication System – Continuously feeds oil through the premium oil filter and crankshaft bearing for enhanced durability and longer engine life.
  • Optional no choke starting with ReadyStart® for Ride.
  • Optional Electronic Fuel Management (EFM) for enhanced, hassle-free starting – just like a car.

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Specs

Model Number
40S8

Gross Horsepower (ft-lbs)*
20

Engine Displacement (cc)
656

Number of Cylinders
V-Twin

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
19.1

Width (in)
18.2

Height (in)
14.3

Weight (lbs)
84

Bore (in)
2.97

Stroke (in)
2.89

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Full Pressure Lubrication

Oil Capacity (oz)
64

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
N/A

Certified Power Rating

Fuel Shutoff Valve
Optional

*All power levels are stated gross torque at 2600 rpm per SAE J1940 as rated by Briggs & Stratton.
**All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.

Model Number
44S6

Gross Horsepower (ft-lbs)*
22

Engine Displacement (cc)
724

Number of Cylinders
V-Twin

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
19.1

Width (in)
18.2

Height (in)
14.3

Weight (lbs)
84

Bore (in)
3.12

Stroke (in)
2.89

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Full Pressure Lubrication

Oil Capacity (oz)
64

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
N/A

Certified Power Rating

Fuel Shutoff Valve
Optional

*All power levels are stated gross torque at 2600 rpm per SAE J1940 as rated by Briggs & Stratton.
**All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.

Model Number
44S8

Gross Horsepower (ft-lbs)*
24

Engine Displacement (cc)
724

Number of Cylinders
V-Twin

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
19.1

Width (in)
18.2

Height (in)
14.3

Weight (lbs)
84

Bore (in)
3.12

Stroke (in)
2.89

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Full Pressure Lubrication

Oil Capacity (oz)
64

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
N/A

Certified Power Rating

Fuel Shutoff Valve
Optional

*All power levels are stated gross torque at 2600 rpm per SAE J1940 as rated by Briggs & Stratton.
**All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.

Model Number
44S9

Gross Horsepower (ft-lbs)*
25

Engine Displacement (cc)
724

Number of Cylinders
V-Twin

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
19.1

Width (in)
18.2

Height (in)
14.3

Weight (lbs)
84

Bore (in)
3.12

Stroke (in)
2.89

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Full Pressure Lubrication

Oil Capacity (oz)
64

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
N/A

Certified Power Rating

Fuel Shutoff Valve
Optional

*All power levels are stated gross torque at 2600 rpm per SAE J1940 as rated by Briggs & Stratton.
**All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.