Kawasaki FX850V-EFI

Kawasaki FX850V-EFIThe Kawasaki FX850V-EFI is a 0.85 l (852 cc, 51.99 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline engine with vertical shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications, commercial mowers, heavy-duty industrial and construction equipment.

The Kawasaki FX850V-EFI has V-twin design with vertical PTO shaft. The motor uses overhead V-valves; spherical combustion chamber; cast iron cylinder liners; integrated clean out ports; proven open loop design. The engine is equipped with sequential multi-port fuel injection; integrated electronic governor; automatic compression release; compact electronic control unit; electronic altitude compensation; electronic ignition system with variable spark timing. The FX850V EFI motor uses a pressurized lubrication system and high-pressure fuel injection system with an electronic fuel pump.

The engine has an automatic compression release (ACR) system with a relectric starter.

An 84.5 mm (3.33 in) cylinder bore and 76.0 mm (2.99 in) piston stroke give the motor a total of 852 cc (51.99 cu-in) of displacement. Compression ratio rating is 8.2:1. The Kawasaki FX850V EFI engine produced 29.9 PS (22.0 kW; 29.5 HP) at 3,600 rpm of maximum horsepower and 65.7 Nm (6.7 kg·m; 48.5 ft·lb) at 2,600 rpm of torque.


General information

Engine Specifications
Type4-stroke, OHV, V-twin 90°
Displacement852 cm 3 (51.99 cu-in)
Max. horsepower29.9 PS (22.0 KW; 29.5 HP) at 3,600 rpm
Max. torque (crank PTO)65.7 Nm (6.7 kg·m; 48.5 ft·lb) at 2,600 rpm
Fuel systemSequential multi-port fuel injection
Cooling systemAir-cooling
Ignition systemElectronic ignition system with variable spark timing
Lubricating systemHigh performance lubrication system
Starting systemHeavy duty shift type starter
Charging system13A or 20A charge coil (option)
Fuel usedUnleaded gasoline (octane number 91 or higher)
Fuel consumption
Cooling systemPressurized forced circulation type


Tightening torque specs

Tightening torque specs
Cylinder head46 Nm; 4.6 kg·m; 33.9 ft·lb
Connecting rod20.6 Nm; 2.1 kg·m; 15.2 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover46 Nm; 4.6 kg·m; 33.9 ft·lb
Intake manifold6 Nm; 0.6 kg·m; 4.4 ft·lb
Oil drain plug7 Nm; 0.7 kg·m; 5.2 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8.1 ft·lb


Maintenance data

Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression4.5 kg/cm2 (64 psi) at 500 rpm
Valve clearance
Intake valve0.10-0.15 mm (0.004-0.006 in)
Exhaust valve0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type4-stroke or an equivalent (SJ or higher class)
Recommended oilSAE 10W-40, 10W-30
Oil capacity (with filter changed) With oil filter: 2.3 litre
Without oil filter: 2.1 litre
Ignition system
Spark plugNGK: BPR4ES
Spark plug gap0.7-0.8 mm (0.027-0.031 in)
Ignition coil air gap0.2-0.4 mm (0.008-0.011 in)
Spark plug tightening torque22 Nm; 2.2 kg·m; 16.2 ft·lb


Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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