Kawasaki FX850V-(B)R31-S 29.5 HP Engine 850 Series

Overhead v-valve

• The Kawasaki FX850V-(B)R31-S features an advanced overhead valve (OHV) configuration, a high-performance design that places the intake and exhaust valves directly above the piston for optimized combustion. This vertical valve arrangement allows for a more efficient and direct airflow path, ensuring the 29.5 HP engine can "breathe" effortlessly even under heavy commercial loads.

90° V-twin

• The Kawasaki FX850V-(B)R31-S is engineered with a 90-degree V-twin cylinder configuration, a premium architecture designed to achieve near-perfect mechanical balance. By positioning the cylinders at a precise right angle, the engine naturally neutralizes primary vibrations, resulting in a 29.5 HP output that feels remarkably smooth and controlled under load.

Pressurized lubrication system

• The Kawasaki FX850V-(B)R31-S is equipped with a high-performance pressurized lubrication system, engineered to provide automotive-grade protection for the engine’s critical internal components. A high-volume pump continuously circulates a regulated flow of oil to the main bearings, crankshaft, and overhead valves, ensuring that every moving part remains encased in a friction-reducing protective film.

Electronic spark ignition

• The Kawasaki FX850V-(B)R31-S utilizes a high-energy electronic spark ignition system, a solid-state technology designed for maintenance-free operation and pinpoint timing. By generating a powerful, consistent spark at the optimal moment in the combustion cycle, this system ensures that the 29.5 HP V-twin fires up instantly and runs with maximum thermal efficiency.

Automatic compression release

• The Kawasaki FX850V-(B)R31-S features an automatic compression release (ACR) system, a mechanical advantage designed to make every start effortless. During the initial cranking phase, the ACR momentarily reduces the pressure within the cylinders, allowing the starter motor to spin the 29.5 HP V-twin over with significantly less resistance.

High efficiency oil cooler

• The Kawasaki FX850V-(B)R31-S is outfitted with a high-efficiency oil cooler, a vital thermal management component designed to keep the engine’s lifeblood at peak performance. This specialized radiator-style heat exchanger pulls excessive heat away from the engine oil, ensuring it maintains its vital viscosity and protective properties even when the 29.5 HP V-twin is subjected to the punishing heat of a mid-summer commercial shift.

Rotating metal grass chopper screen

• The Kawasaki FX850V-(B)R31-S features a rotating metal grass chopper screen, an active filtration system built to survive the debris-heavy environment of professional lawn care. As the engine runs, this heavy-duty metal screen spins at high speeds, using integrated blades to physically shred grass, leaves, and organic matter into fine particles before they can reach the cooling system.

Multi-Stage canister air filter

• Features an industrial-grade multi-stage canister filtration system engineered to trap microscopic dust and debris, ensuring maximum engine defense in extreme conditions

Cast-iron cylinder liners

• The Kawasaki FX850V-R31-S is an elite 29.5 HP commercial engine engineered for extreme-duty applications where maximum power and durability are non-negotiable. It features a heavy-duty multi-stage canister air filtration system that provides superior engine defense by trapping fine contaminants in the dustiest environments, paired with rugged cast-iron cylinder liners that ensure exceptional wear resistance and long-term structural integrity. This high-output V-twin is further protected by a pressurized lubrication system and a high-efficiency oil cooler to manage thermal loads, while the metal engine cover with integrated clean-out ports and rotating grass chopper screen simplify maintenance by keeping the cooling system free of debris.

Metal engine cover with integrated clean out ports

• The Kawasaki FX850V-R31-S is a premium 29.5 HP powerhouse designed for elite commercial performance, featuring a heavy-duty metal engine cover engineered with integrated clean-out ports for rapid debris removal and effortless maintenance. This rugged housing works in tandem with a rotating grass chopper screen to ensure maximum airflow, while the engine’s internal integrity is bolstered by industrial-grade cast-iron cylinder liners and a high-efficiency oil cooler for superior thermal management. To ensure peak reliability in the harshest environments, the unit is equipped with a multi-stage canister air filtration system and a pressurized lubrication system, delivering a high-output solution that combines massive power with long-term mechanical durability.

Heavy duty shift-type starter

• The Kawasaki FX850V-R31-S features an automotive-grade, heavy-duty solenoid-shift starter engineered to provide high-torque cranking and positive gear engagement for absolute reliability. This industrial-strength starting system is built to withstand the rigors of frequent daily ignitions in demanding commercial environments, ensuring a powerful and consistent engine turnover every time. By utilizing a rugged shift-type mechanism, the starter minimizes mechanical wear and ensures dependable performance even in extreme weather conditions, making it an essential component for high-output 29.5 HP applications.