EX Series™ Engines
EX Series™ Engines
Efficient and durable performance.
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. Make starting easier – just like a car – with our optional no choke technology.
- Advanced Debris Management System – Helps our engines run cleaner and longer by deflecting and ejecting grass and debris, providing a longer life.
- AVS® Anti-Vibration System - Gives you a smoother ride, saving wear and tear on your engine, your equipment and you.
- Optional ReadyStart® for Ride for easy, automotive-style starting.
Click and drag image to rotate.
344 - 540cc
Displacement
Gas
Engine Fuel
Features
Specs
Only 2 products can be compared at once. Please remove one of your selections to compare this product.
Only 3 products can be compared at once. Please remove one of your selections to compare this product.
At least one product must be displayed. Please select another option to remove this product
Model Number
21R7
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)
Oil Capacity (oz)
48
Lubrication System
Partial Lubrication System
Oil Filter
Standard
Starter
Electric Start, Recoil Optional
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
10.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
21R8
Torque (ft-lbs, gross)*
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)
Oil Capacity (oz)
48
Lubrication System
Partial Lubrication System
Oil Filter
Standard
Starter
Electric Start, Recoil Optional
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
11.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
31R5
Torque (ft-lbs, gross)*
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
Oil Capacity (oz)
48
Lubrication System
Partial Lubrication System
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
13.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
31R7
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
Oil Capacity (oz)
48
Lubrication System
Partial Lubrication System
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
15.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
31R9
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
Oil Capacity (oz)
48
Lubrication System
Partial Lubrication System
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
17.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
33R8
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
Oil Capacity (oz)
48
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Dual Element Cartridge with Advanced Debris Management
Muffler
Optional
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
48
Marketing Number of Cylinders
1
Marketing Gross Horsepower
10.5 - 19.0
Gross Horsepower
19
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Model Number
21R7
21R8
31R5
31R7
31R9
33R8
Engine Displacement (cc)
344
344
500
500
500
540
Number of Cylinders
Single
Single
Single
Single
Single
Single
Engine Configuration
Vertical Shaft
Vertical Shaft
Vertical Shaft
Vertical Shaft
Vertical Shaft
Vertical Shaft
OHV Engine
true
true
true
true
true
true
Length (in)
17.8
17.8
18.9
18.9
18.9
18.9
Width (in)
15.5
15.5
15.5
15.5
15.5
16.2
Height (in)
12.9
12.9
12.9
12.9
12.9
12.9
Weight (lbs)
66
66
77
77
77
77
Bore (in)
3.44
3.44
3.56
3.56
3.56
3.70
Stroke (in)
2.26
2.26
3.06
3.06
3.06
3.06
Engine Fuel
Gasoline
Gasoline
Gasoline
Gasoline
Gasoline
Gasoline
Fuel Tank Capacity (gal)
0.7 (optional)
0.7 (optional)
N/A
N/A
N/A
N/A
Oil Capacity (oz)
48
48
48
48
48
48
Lubrication System
Partial Lubrication System
Partial Lubrication System
Partial Lubrication System
Partial Lubrication System
Partial Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Standard
Standard
Standard
Standard
Standard
Starter
Electric Start, Recoil Optional
Electric Start, Recoil Optional
Electric Start
Electric Start
Electric Start
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Cartridge Air Cleaner with Advanced Debris Management
Cartridge Air Cleaner with Advanced Debris Management
Cartridge with Advanced Debris Management
Cartridge with Advanced Debris Management
Dual Element Cartridge with Advanced Debris Management
Muffler
Optional
Optional
Optional
Optional
Optional
Optional
Fuel Shutoff Valve
Optional
Optional
Optional
Optional
Optional
Optional
Certified Power Rating
Marketing Oil Capacity
48
48
48
48
48
48
Marketing Number of Cylinders
1
1
1
1
1
1
Marketing Gross Horsepower
10.5 - 19.0
10.5 - 19.0
10.5 - 19.0
10.5 - 19.0
10.5 - 19.0
10.5 - 19.0
Gross Horsepower
10.5
11.5
13.5
15.5
17.5
19
Torque (ft-lbs, gross)*
11.5
13.5
* All power levels are stated gross horsepower at 3600 rpm per SAE J1940 as rated by Briggs & Stratton.
Conquer Your Yard
At the end of the day, a job well done is its own reward. Our equipment is there to help make it happen. It's easy to master, durable and ready for a challenge. Just like you.
