Kawasaki FR651V-KS00-S 21.5HP Vertical Shaft Engine

The Kawasaki FR651V-KS00-S is a 21.5HP, 726cc V-Twin vertical shaft engine designed for premium residential ride-on mowers and light-commercial zero-turn applications. Built on Kawasaki’s proven FR-Series platform, this engine delivers smooth operation, dependable starting, and strong torque for demanding mowing conditions.

Featuring a 90° OHV V-Twin configuration, the FR651V provides balanced performance with reduced vibration and efficient airflow. Its pressurised lubrication system, cast-iron cylinder liners, and durable air-cooled design ensure long service life and reliable operation on large properties, acreage blocks, and contractor-level applications where durability matters.

An internally vented carburettor with fuel shut-off solenoid, electronic ignition, and automatic compression release make starting easy and fuel delivery stable. The rotating metal debris screen helps maintain cooling efficiency, while the 1″ × 80mm vertical crankshaft allows compatibility with many popular mower decks and zero-turn platforms.

Key Features

• 21.5HP Kawasaki V-Twin engine for high-end ride-ons and ZTR mowers

• 726cc displacement producing strong low-RPM torque

• 90° OHV V-Twin layout for smooth, balanced performance

• Pressurised lubrication system for extended engine protection

• Electronic spark ignition for consistent starting

• Automatic compression release for easier cranking

• Single-stage air filter suitable for general mowing conditions

• Internally vented carburettor with fuel shut-off solenoid

• Cast-iron cylinder liners for extended engine life

• Rotating metal debris/grass screen to maintain cooling efficiency

• Electric start

• 1″ × 80mm vertical crankshaft fits many popular mower models

Technical Specifications

• Engine Type: 4-stroke, vertical-shaft, air-cooled OHV V-Twin

• Cylinders: 2

• Displacement: 726 cc (44.3 cu in)

• Compression Ratio: 8.2:1

• Maximum Power: 21.5 HP (16.0 kW) @ 3600 RPM

• Maximum Torque: 39.3 ft-lb (53.3 Nm) @ 2200 RPM

• Dry Weight: 40.0 kg (88.2 lb)

• Crankshaft: 1″ diameter × 80 mm length

Applications & Compatibility

• Residential and acreage ride-on mowers

• Light-commercial zero-turn mowers

• Equipment requiring a 1″ × 80mm vertical shaft Kawasaki engine

Always confirm crankshaft dimensions, wiring, and mounting requirements before purchase.

Why Choose the Kawasaki FR651V?

• Strong, smooth power for larger properties and acreage work

• Proven Kawasaki FR-Series reliability

• Low vibration and easy starting

• Excellent balance between residential comfort and light-commercial durability

• Cost-effective alternative to replacing an entire mower

Important Notes

• Fuel tank and muffler not included

• Horsepower rated according to SAE J1995 standards