EXi Series™ Engines

EXi Series™ Engines

Higher power, performance and durability.

Our EXi Series V-Twin riding mower engines are all about performance. The V-Twin design delivers more power, is naturally balanced for less vibration, and runs cooler and cleaner thanks to its full pressure lubrication system and advanced air filtering. It all adds up to less wear on components for longer life and reduced maintenance. Want more? Choose our ReadyStart® for Ride option to start your mower as easily as a car – just turn the key or push the button and go.

  • 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 crank pin bearing for enhanced durability and longer engine life.
  • Optional no choke starting.

656 - 724cc

Displacement

Gas

Engine Fuel

Features

Made in the USA

Made in the USA of US and global parts.

ReadyStart® for Ride Technology

Automotive-style, no choke easy starting. Just turn the key or push the button and go.

Advanced Debris Management System

Keeps the engine clean by deflecting and ejecting grass and debris for a longer engine life.

Full Pressure Lube System

Reduces component wear for longer engine life.

V-Twin Engine

For more power, comfort and durability.

Specs

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Model Number
40R6
Engine Displacement (cc)
656
Number of Cylinders
V-Twin
Engine Configuration
Vertical Shaft
OHV Engine
Yes
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
Oil Capacity (oz)
64
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
64
Marketing Number of Cylinders
2
Marketing Gross Horsepower
16.0 - 24.0
Gross Horsepower
16

*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
40R7
Engine Displacement (cc)
656
Number of Cylinders
V-Twin
Engine Configuration
Vertical Shaft
OHV Engine
Yes
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
Oil Capacity (oz)
64
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
64
Marketing Number of Cylinders
2
Marketing Gross Horsepower
16.0 - 24.0
Gross Horsepower
18

*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
40R8
Engine Displacement (cc)
656
Number of Cylinders
V-Twin
Engine Configuration
Vertical Shaft
OHV Engine
Yes
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
Oil Capacity (oz)
64
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
64
Marketing Number of Cylinders
2
Marketing Gross Horsepower
16.0 - 24.0
Gross Horsepower
20

*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
44R6
Engine Displacement (cc)
724
Number of Cylinders
V-Twin
Engine Configuration
Vertical Shaft
OHV Engine
Yes
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
Oil Capacity (oz)
64
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
64
Marketing Number of Cylinders
2
Marketing Gross Horsepower
16.0 - 24.0
Gross Horsepower
22

*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
44R8
Engine Displacement (cc)
724
Number of Cylinders
V-Twin
Engine Configuration
Vertical Shaft
OHV Engine
Yes
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
Oil Capacity (oz)
64
Lubrication System
Full Pressure Lubrication
Oil Filter
Standard
Starter
Electric Start
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
Fuel Shutoff Valve
Optional
Certified Power Rating
Marketing Oil Capacity
64
Marketing Number of Cylinders
2
Marketing Gross Horsepower
16.0 - 24.0
Gross Horsepower
24

*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
40R6
40R7
40R8
44R6
44R8
Engine Displacement (cc)
656
656
656
724
724
Number of Cylinders
V-Twin
V-Twin
V-Twin
V-Twin
V-Twin
Engine Configuration
Vertical Shaft
Vertical Shaft
Vertical Shaft
Vertical Shaft
Vertical Shaft
OHV Engine
Yes
Yes
Yes
Yes
Yes
Length (in)
19.1
19.1
19.1
19.1
19.1
Width (in)
18.2
18.2
18.2
18.2
18.2
Height (in)
14.3
14.3
14.3
14.3
14.3
Weight (lbs)
84
84
84
84
84
Bore (in)
2.97
2.97
2.97
3.12
3.12
Stroke (in)
2.89
2.89
2.89
2.89
2.89
Engine Fuel
Gasoline
Gasoline
Gasoline
Gasoline
Gasoline
Fuel Tank Capacity (gal)
N/A
N/A
N/A
N/A
N/A
Oil Capacity (oz)
64
64
64
64
64
Lubrication System
Full Pressure Lubrication
Full Pressure Lubrication
Full Pressure Lubrication
Full Pressure Lubrication
Full Pressure Lubrication
Oil Filter
Standard
Standard
Standard
Standard
Standard
Starter
Electric Start
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 Air Cleaner with Advanced Debris Management
Cartridge Air Cleaner with Advanced Debris Management
Muffler
N/A
N/A
N/A
N/A
N/A
Fuel Shutoff Valve
Optional
Optional
Optional
Optional
Optional
Marketing Oil Capacity
64
64
64
64
64
Marketing Number of Cylinders
2
2
2
2
2
Marketing Gross Horsepower
16.0 - 24.0
16.0 - 24.0
16.0 - 24.0
16.0 - 24.0
16.0 - 24.0
Gross Horsepower
16
18
20
22
24

*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.

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