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 32°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..
3-Year Limited Warranty – Now standard on large vertical PXi Series engines starting with 2025 production, with coverage for both commercial and residential use.

To learn more, download our product literature.

Model Number

40U8

Gross Horsepower (ft-lbs)*

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)

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)

Oil Filter

Premium

Starter

Electric Start

Air Filter

Dual Element Cartridge with Advanced Debris Management

Muffler

N/A

Certified Power Rating

Download Power Curve

Fuel Shutoff Valve

Optional

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

Model Number

44U6

Gross Horsepower (ft-lbs)*

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)

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)

Oil Filter

Premium

Starter

Electric Start

Air Filter

Dual Element Cartridge with Advanced Debris Management

Muffler

N/A

Certified Power Rating

Download Power Curve

Fuel Shutoff Valve

Optional

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

Model Number

44U8

Gross Horsepower (ft-lbs)*

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)

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)

Oil Filter

Premium

Starter

Electric Start

Air Filter

Dual Element Cartridge with Advanced Debris Management

Muffler

N/A

Certified Power Rating

Download Power Curve

Fuel Shutoff Valve

Optional

^{* 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)*

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)

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)

Oil Filter

Premium

Starter

Electric Start

Air Filter

Dual Element Cartridge with Advanced Debris Management

Muffler

N/A

Certified Power Rating

Download Power Curve

Fuel Shutoff Valve

Optional

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

Briggs & Stratton PXi Series Engines

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Briggs & Stratton PXi Series Engines

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