Kawasaki FX921V-S04 31 HP 1-1/8" x 4-5/16" Vertical Shaft

FX921V-S04 Electric Start Engine

In-stock Now!

Command the toughest jobs on the turf with the legendary power of the Kawasaki FX921V-S04. Delivering 31 horsepower from a massive 999cc V-Twin block, this severe-duty vertical shaft engine is built for demanding commercial mowing, landscaping, and industrial applications. Featuring a twin-barrel carburetor with a fuel shut-off solenoid and a standard 1-1/8" x 4-5/16" straight keyed shaft, the FX921V-S04 provides the durability and dependable performance professional equipment owners expect from Kawasaki.

Proven Carbureted Fuel Delivery for Commercial Equipment

The Kawasaki FX921V-S04 uses a proven twin-barrel carburetor designed to deliver dependable fuel delivery across demanding operating conditions. A built-in fuel shut-off solenoid provides additional control of fuel flow when the engine is shut down, while the engine's electronic spark ignition and heavy-duty electric starter help provide reliable starting and consistent operation.

For commercial landscapers and equipment owners, the carbureted design also provides a familiar, serviceable fuel system that integrates naturally with many existing commercial mower and turf equipment applications.

Massive 999cc Displacement Engineered for Heavy Workloads

When you are operating high-capacity zero-turn fleets, maintaining extensive municipal grounds, or powering demanding industrial equipment, dependable engine performance is critical. The FX921V-S04 combines its large 999cc displacement with a 90-degree V-Twin configuration to deliver the power and torque required for challenging workloads.

Its 31 HP output provides the muscle needed to handle dense grass, variable terrain, and extended operating periods while helping commercial equipment maintain consistent performance throughout the job.

Severe-Duty Contaminant Defense and Thermal Control

Abrasive dust, flying grass debris, and high operating temperatures are constant challenges for commercial turf equipment. To help protect the engine, the FX921V-S04 uses a heavy-duty multi-stage canister air filtration system designed to keep contaminants away from critical internal components.

Internally, a pressurized lubrication system works alongside a high-efficiency oil cooler to help maintain proper lubrication and operating temperatures during extended use. Cast-iron cylinder liners, a rotating metal grass chopper screen, and a durable metal engine cover further support the FX921V's commercial-duty design.

Logistics, Sourcing & Support Notes

Exhaust / Muffler: Not included. Verify that your existing compatible exhaust assembly can be transferred or select the appropriate replacement exhaust configuration for your equipment.

Built for Long-Term Commercial Use: With a rugged commercial-duty design and a dry weight of approximately 138 lbs., the FX921V is engineered for demanding professional applications. Genuine Kawasaki maintenance and replacement parts are also widely available to support ongoing service.

Freight Shipping Notice: Due to its industrial weight, this unit is securely crated and shipped via heavy freight. We provide complimentary shipping directly to any commercial address equipped with a forklift or loading dock. Direct residential delivery is available but will incur additional carrier fees.

Commercial Replacement Engine & Fleet Integration

The FX921V-S04's vertical shaft configuration makes it well suited for compatible commercial zero-turn mowers, turf equipment, and other heavy-duty machinery requiring a high-output Kawasaki vertical shaft engine.

When replacing an existing engine, always verify the crankshaft diameter and length, mounting configuration, electrical connections, throttle and choke controls, exhaust configuration, and equipment-specific requirements before ordering.

Add Genuine OEM Kawasaki Fuel Treatment. This 12oz bottle is designed to help protect your engine!