Description

High Performance and Extended Durability

Built for Big Acreage. Saddle up with the right engine in your riding mower, and you have the power to get the perfect cut, consistent starting and durable components that add up to a long engine life. Briggs & Stratton riding mower engines deliver consistent high performance, from single-cylinder models to durable v-twin engines that can power zero-turn mowers and tractors with large mowing decks to handle the biggest landscapes.

Features
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.
ReadyStart® for Ride Technology: Automotive-style, no choke easy starting. Just turn the key or push the button and go.
Anti-Vibration System – AVS®: Provides a smoother ride and more comfort.
Full Pressure Lube System: Reduces component wear for longer engine life.
Specifications
Model Number: 31S9
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: Full Pressure Lubrication
Oil Filter: Premium
Air Filter: Dual Element Cartridge with Advanced Debris Management
HP (gross) **: 17.5.0
Number of Cylinders: Single
OHV Engine: Yes
Width (in): 16.2
Weight (lbs): 77
Stroke (in): 3.06
Fuel Tank Capacity (gal): N/A
Oil Capacity (oz): 48
Starter: Electric Start
Muffler: Optional
NOTES:
* When compared against the expected life standards of a Briggs & Stratton Intek™ Series Engine.

*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.