Kawasaki FX801V

Kawasaki FX801VThe Kawasaki FX801V 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 FX801V has V-twin design with vertical PTO shaft. The motor uses overhead V-valves; spherical combustion chamber; cast-iron cylinder liners; metal engine cover with integrated cleanout ports; rotating metal grass chopper screen. The engine is equipped with electronic spark ignition and twin-barrel, internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system with high-efficiency oil cooler and double or multi-stage canister air filter.

The engine has an automatic compression release (ACR) system with recoil or heavy-duty shift-type starter. 13A or 20A charge coils, various oil drains, oil pressure switches, and shaft variations are available as an option.

A 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 FX801V engine produced 27.1 PS (19.9 kW; 26.6 HP) at 3,600 rpm or 25.8 PS (19.0 kW; 25.5 HP) at 3,600 rpm of maximum horsepower and 63.0 Nm (6.4 kg·m; 46.5 ft·lb) at 2,400 rpm or 60.5 Nm (6.2 kg·m; 44.6 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
Model FX801V
Type 4-stroke, OHV, V-twin 90°
Displacement 852 cm 3 (51.99 cu-in)
Max. horsepower 27.1 PS (19.9 KW; 26.6 HP) at 3,600 rpm
25.8 PS (19.0 KW; 25.5 HP) at 3,600 rpm
Max. torque (crank PTO) 63.0 Nm (6.4 kg·m; 46.5 ft·lb) at 2,400 rpm
60.5 Nm (6.2 kg·m; 44.6 ft·lb) at 2,400 rpm
Carburetor Twin barrel, internally vented carburetor
Cooling system Air-cooling
Ignition system Electronic spark ignition
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

Dimensions and Weight

Kawasaki FX801V
Length, mm (in) 488 (19.2)
Width, mm (in) 472 (18.6)
Height, mm (in) 626 (24.6)
Dry weight, kg (lb) 56.4 (124.3)

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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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.


  1. hello,having issues with deciding whether or not i should replace my fx801v ( on exmark s mower) that has thrown a connecting rod thru block, with another new same motor.

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