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    Professional Series™ (Single Cylinder)

    Professional Series Single Cylinder

    Professional Series™ (Single Cylinder)

    World-class performance – time after time. With commercial-grade power, easy starting and quiet operation, the Professional Series riding mower engine delivers great results for your toughest jobs. And it keeps delivering, because this mower engine is built to last with our exclusive Advanced Debris Management System, chrome-plated exhaust valves and other durable features.

    17.5 - 19.0

    Gross Horsepower (HP)

    500 - 540

    Displacement (cc)

    1.4

    Oil Capacity (L)

    2 Years

    Warranty
    Feature

    Features

    Professional Series™ Rider Mower Engines

    Single cylinder and V-twin engines offer the best of both worlds: world-class endurance and power.

    Advanced Debris Management System

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

    Anti-Vibration System - AVS®

    Provides a smoother ride and more comfort.

    No Prime, No Choke

    1-Step Start, just pull for power.

    Specifications

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    Model Number
    31S9
    Gross Horsepower (ft-lbs)*
    17.5
    Displacement (cc)
    500
    Cylinder Type
    Cast Iron Sleeve
    Engine Description
    Single cylinder, 4-stroke, air cooled, OHV (Overhead Valve)
    Length (in)
    479
    Width (in)
    411
    Height (in)
    327
    Weight (kg)
    29.5
    Bore (mm)
    90.5
    Stroke (mm)
    77.8
    Oil Capacity (L)
    1.4

    *Power levels are stated gross horsepower at 3600rpm per SAE J1940 as rated by Briggs & Stratton.
    †See briggsandstratton.com for warranty details.

    Model Number
    33S8
    Gross Horsepower (ft-lbs)*
    19.0
    Displacement (cc)
    540
    Cylinder Type
    Cast Iron Sleeve
    Engine Description
    Single cylinder, 4-stroke, air cooled, OHV (Overhead Valve)
    Length (in)
    479
    Width (in)
    411
    Height (in)
    327
    Weight (kg)
    29.5
    Bore (mm)
    94.0
    Stroke (mm)
    77.8
    Oil Capacity (L)
    1.4

    *Power levels are stated gross horsepower at 3600rpm per SAE J1940 as rated by Briggs & Stratton.
    †See briggsandstratton.com for warranty details.

    Model Number
    31S9
    33S8
    Gross Horsepower (ft-lbs)*
    17.5
    19.0
    Displacement (cc)
    500
    540
    Cylinder Type
    Cast Iron Sleeve
    Cast Iron Sleeve
    Engine Description
    Single cylinder, 4-stroke, air cooled, OHV (Overhead Valve)
    Single cylinder, 4-stroke, air cooled, OHV (Overhead Valve)
    Length (in)
    479
    479
    Width (in)
    411
    411
    Height (in)
    327
    327
    Weight (kg)
    29.5
    29.5
    Bore (mm)
    90.5
    94.0
    Stroke (mm)
    77.8
    77.8
    Oil Capacity (L)
    1.4
    1.4

    *Power levels are stated gross horsepower at 3600rpm per SAE J1940 as rated by Briggs & Stratton.
    †See briggsandstratton.com for warranty details.

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