Briggs & Stratton EX Series™ Engines

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Stock status: Call Store for Availability

With more power and features, our EX Series riding mower engines give you the performance you need. The lubrication system extends engine life, and includes a standard oil filter and oil pump to push clean oil to critical components. Superior air filtering and reduced vibration come standard. Make starting easier – just like a car – with our optional no choke technology.


Specs

Model Number
21R7

Gross Horsepower (ft-lbs)*
10.5

Engine Displacement (cc)
344

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
17.8

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
66

Bore (in)
3.44

Stroke (in)
2.26

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
0.7 (optional)

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Standard

Starter
Electric Start, Recoil Optional

Air Filter
Cartridge Air Cleaner with Advanced Debris Management

Muffler
Optional

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
21R8

Gross Horsepower (ft-lbs)*
11.5

Engine Displacement (cc)
344

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
17.8

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
66

Bore (in)
3.44

Stroke (in)
2.26

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
0.7 (optional)

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Standard

Starter
Electric Start, Recoil Optional

Air Filter
Cartridge Air Cleaner with Advanced Debris Management

Muffler
Optional

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
31R5

Gross Horsepower (ft-lbs)*
13.5

Engine Displacement (cc)
500

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.56

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Standard

Starter
Electric Start

Air Filter
Cartridge Air Cleaner with Advanced Debris Management

Muffler
Optional

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
31R6

Gross Horsepower (ft-lbs)*
14.5

Engine Displacement (cc)
500

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.56

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Standard

Starter
Electric Start

Air Filter
Cartridge Air Cleaner with Advanced Debris Management

Muffler
Optional

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
31R7

Gross Horsepower (ft-lbs)*
15.5

Engine Displacement (cc)
500

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.56

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
Optional

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
31R8

Gross Horsepower (ft-lbs)*
16.5

Engine Displacement (cc)
500

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.56

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
Optional

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
31R9

Gross Horsepower (ft-lbs)*
17.5

Engine Displacement (cc)
500

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
15.5

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.56

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
Optional

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
33R7

Gross Horsepower (ft-lbs)*
18.5

Engine Displacement (cc)
540

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
16.2

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.70

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Partial Lubrication System

Oil Capacity (oz)
48

Oil Filter
Standard

Starter
Electric Start

Air Filter
Cartridge Air Cleaner with Advanced Debris Management

Muffler
Optional

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
33R8

Gross Horsepower (ft-lbs)*
19

Engine Displacement (cc)
540

Number of Cylinders
Single

Engine Configuration
Vertical Shaft

OHV Engine
true

Length (in)
18.9

Width (in)
16.2

Height (in)
12.9

Weight (lbs)
77

Bore (in)
3.70

Stroke (in)
3.06

Engine Fuel
Gasoline

Fuel Tank Capacity (gal)
N/A

Lubrication System
Full Pressure Lubrication

Oil Capacity (oz)
48

Oil Filter
Premium

Starter
Electric Start

Air Filter
Dual Element Cartridge with Advanced Debris Management

Muffler
Optional

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.