Kawasaki FS691V-JS08-S 22HP V-Twin Vertical Shaft Engine Electric Start

Designed for tough work in tight spaces, the 90° V-twin 4-cycle Kawasaki FS691V engine can help turn your zero-turn mower or lawn tractor into an impressive force of landscaping precision. Featuring a rotating grass screen and dual-element reinforced air filter, pressurized lubrication system, and cast-iron cylinder liners, this engine helps provide peak productivity.

Features:

Engine performance, by the numbers.

• From power and torque numbers to engine features and more, the following is here to help communicate engine performance details and capabilities. Be sure to consider these specs to help ensure the engine you’re choosing is a match to your mowing needs.

Overhead V-valve

• This 22HP V-Twin engine features an Overhead Valve (OHV) design that optimizes combustion efficiency and thermal management. By positioning the valves for a more direct intake and exhaust flow, this system provides greater fuel economy and a significant reduction in oil consumption, ensuring your engine runs cleaner and longer during demanding tasks.

Integrated clean out ports

• Keep your engine running at peak performance with integrated clean-out ports. These built-in access points allow you to easily blow out trapped grass and debris from the cooling fins without the hassle of removing the entire engine shroud. It’s a smart, time-saving feature designed to prevent overheating and ensure a longer engine life.

90° V-twin

• The FS691V utilizes a 90-degree V-Twin design to achieve superior primary balance. This geometric orientation minimizes harmonic vibration and promotes more efficient cooling around each cylinder. The result is a compact, high-displacement 726cc engine that offers industrial-grade reliability and a smoother power curve.

Pressurized lubrication system

• Protect your engine on any terrain with a high-capacity pressurized lubrication system. Unlike standard splash systems, this setup uses a dedicated pump to force clean oil directly to critical bearings and moving parts. This ensures consistent protection and cooling—even when mowing on inclines or uneven hills—giving you the confidence to tackle challenging landscapes.

Electronic spark ignition

• The FS691V features a digital electronic ignition system designed for precision timing and optimal fuel combustion. By removing mechanical wear points, this solid-state design provides a more stable idle, reduced exhaust emissions, and consistent 22HP power delivery throughout the engine’s entire lifecycle.

Automatic compression release

• Take the stress out of ignition with the Automatic Compression Release (ACR) system. This smart mechanical feature momentarily vents cylinder pressure during the starting cycle, allowing the engine to turn over with significantly less effort. It ensures a fast, reliable start every time while drastically reducing the workload—and wear—on your battery and starter motor.

Internally vented carburetor with fuel shut-off solenoid

• Maintain peak 22HP performance even in the dustiest conditions with an internally vented carburetor. This smart design balances air pressure within the fuel bowl to prevent power loss as the air filter traps debris. For added peace of mind, an integrated fuel shut-off solenoid instantly stops fuel flow when the engine is turned off, preventing backfiring and ensuring a quiet, safe shutdown every time.

Rotating metal grass chopper screen

• Keep your engine running cool with a heavy-duty rotating metal grass chopper screen. This isn't just a guard; it's an active defense system that shreds grass and organic debris on contact. By pulverizing material before it can clog the intake, it ensures a constant flow of fresh air to the cylinders, maintaining peak 22HP performance even in the messiest mowing conditions.

Dual element air filtration system with reinforced primary filter

• Protect your 22HP investment with a commercial-grade dual-element air system. This setup utilizes a reinforced primary filter with a rigid structure to withstand high-volume airflow without deforming, while a secondary inner element catches microscopic particles. It’s a multi-layered defense designed to keep your engine breathing clean air, even in the middle of a dry, dusty summer.

Cast-iron cylinder liners

• A professional-grade 726cc powerhouse designed for superior durability and smooth operation. Featuring a vertical shaft and heavy-duty electric start, this FS-Series engine is the gold standard for high-performance zero-turn mowers and commercial-grade turf equipment.