PowerBuilt™ Series

Reliable Performance, Exceptional Value

Efficient and capable engine design that stands the test of time.

10.5 - 17.5

Gross HP

344 - 500cc

Displacement

1

No. of Cylinders

48

Oil Capacity (oz)

Features

Anti-Vibration System - AVS®

Provides a smoother ride and more comfort.

Made in the USA

Made in the USA of US and global parts.

Advanced Debris Management System

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

Specs

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Model Number
21R7
Engine Displacement (cc)
344
Engine Configuration
Vertical Shaft
Length (in)
17.8
Height (in)
12.9
Bore (in)
3.44
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
10.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
66
Stroke (in)
2.26
Fuel Tank Capacity (gal)
0.7 (optional)
Oil Capacity (oz)
48.0
Starter
Electric Start, Recoil Optional
Muffler
Optional
Model Number
21R8
Engine Displacement (cc)
344
Engine Configuration
Vertical Shaft
Length (in)
17.8
Height (in)
12.9
Bore (in)
3.44
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
11.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
66
Stroke (in)
2.26
Fuel Tank Capacity (gal)
0.7 (optional)
Oil Capacity (oz)
48.0
Starter
Electric Start, Recoil Optional
Muffler
Optional
Model Number
31R5
Engine Displacement (cc)
500
Engine Configuration
Vertical Shaft
Length (in)
18.9
Height (in)
12.9
Bore (in)
3.56
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
13.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
77
Stroke (in)
3.06
Fuel Tank Capacity (gal)
N/A
Oil Capacity (oz)
48.0
Starter
Electric start, recoil optional
Muffler
Optional
Model Number
31R6
Engine Displacement (cc)
500
Engine Configuration
Vertical Shaft
Length (in)
18.9
Height (in)
12.9
Bore (in)
3.56
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
14.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
77
Stroke (in)
3.06
Fuel Tank Capacity (gal)
N/A
Oil Capacity (oz)
48.0
Starter
Electric start, recoil optional
Muffler
Optional
Model Number
31R7
Engine Displacement (cc)
500
Engine Configuration
Vertical Shaft
Length (in)
18.9
Height (in)
12.9
Bore (in)
3.56
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
15.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
77
Stroke (in)
3.06
Fuel Tank Capacity (gal)
N/A
Oil Capacity (oz)
48.0
Starter
Electric start, recoil optional
Muffler
Optional
Model Number
31R8
Engine Displacement (cc)
500
Engine Configuration
Vertical Shaft
Length (in)
18.9
Height (in)
12.9
Bore (in)
3.56
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
16.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
77
Stroke (in)
3.06
Fuel Tank Capacity (gal)
N/A
Oil Capacity (oz)
48.0
Starter
Electric start, recoil optional
Muffler
Optional
Model Number
31R9
Engine Displacement (cc)
500
Engine Configuration
Vertical Shaft
Length (in)
18.9
Height (in)
12.9
Bore (in)
3.56
Engine Fuel
Gasoline
Lubrication System
Dura-Lube Splash Lubrication
Oil Filter
N/A
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Certified Power Rating
HP (gross) **
17.50.0
Number of Cylinders
Single
OHV Engine
Yes
Width (in)
15.5
Weight (lbs)
77
Stroke (in)
3.06
Fuel Tank Capacity (gal)
N/A
Oil Capacity (oz)
48.0
Starter
Electric start, recoil optional
Muffler
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
21R7
21R8
HP (gross) **
11.50.0
10.50.0
11.50.0
Engine Displacement (cc)
344
344
344
Number of Cylinders
Single
Single
Single
Engine Configuration
Vertical Shaft
Vertical Shaft
Vertical Shaft
OHV Engine
Yes
Yes
Yes
Length (in)
17.8
17.8
17.8
Width (in)
15.5
15.5
15.5
Height (in)
12.9
12.9
12.9
Weight (lbs)
66
66
66
Bore (in)
3.44
3.44
3.44
Stroke (in)
2.26
2.26
2.26
Engine Fuel
Gasoline
Gasoline
Gasoline
Fuel Tank Capacity (gal)
0.7 (optional)
0.7 (optional)
0.7 (optional)
Lubrication System
Dura-Lube Splash Lubrication
Dura-Lube Splash Lubrication
Dura-Lube Splash Lubrication
Oil Capacity (oz)
48.0
48.0
48.0
Oil Filter
N/A
N/A
N/A
Starter
Electric Start, Recoil Optional
Electric Start, Recoil Optional
Electric Start, Recoil Optional
Air Filter
Cartridge Air Cleaner with Advanced Debris Management
Cartridge Air Cleaner with Advanced Debris Management
Cartridge Air Cleaner with Advanced Debris Management
Muffler
Optional
Optional
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.

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