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
Model FX850V-EFI
Type 4-stroke, OHV, V-twin 90°
Displacement 852 cm 3 (51.99 cu-in)
Max. horsepower 29.9 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 system Sequential multi-port fuel injection
Cooling system Air-cooling
Ignition system Electronic ignition system with variable spark timing
Lubricating system High performance lubrication system
Starting system Heavy duty shift type starter
Charging system 13A or 20A charge coil (option)
Fuel used Unleaded gasoline (octane number 91 or higher)
Fuel consumption
Cooling system Pressurized forced circulation type


Tightening torque specs

Tightening torque specs
Cylinder head 46 Nm; 4.6 kg·m; 33.9 ft·lb
Connecting rod 20.6 Nm; 2.1 kg·m; 15.2 ft·lb
Flywheel 56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover 46 Nm; 4.6 kg·m; 33.9 ft·lb
Intake manifold 6 Nm; 0.6 kg·m; 4.4 ft·lb
Oil drain plug 7 Nm; 0.7 kg·m; 5.2 ft·lb
Valve clearance lock nut 11 Nm; 1.1 kg·m; 8.1 ft·lb


Maintenance data

Maximum speed 3500 ± 100 rpm
Idle speed 1500 ± 100 rpm
Cylinder compression 4.5 kg/cm2 (64 psi) at 500 rpm
Valve clearance
Intake valve 0.10-0.15 mm (0.004-0.006 in)
Exhaust valve 0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type 4-stroke or an equivalent (SJ or higher class)
Recommended oil SAE 10W-40, 10W-30
Oil capacity (with filter changed) With oil filter: 2.3 litre
Without oil filter: 2.1 litre
Ignition system
Spark plug NGK: BPR4ES
Spark plug gap 0.7-0.8 mm (0.027-0.031 in)
Ignition coil air gap 0.2-0.4 mm (0.008-0.011 in)
Spark plug tightening torque 22 Nm; 2.2 kg·m; 16.2 ft·lb


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