The 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.
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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 |
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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 |
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Maintenance data
| Engine | |
| 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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