Kawasaki FX651V

Kawasaki FX651VThe Kawasaki FX651V is a 0.73 l (726 cc, 44.3 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 FX651V 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 internally vented carburetor with fuel shut-off solenoid. The motor uses a high-performance lubrication system and single 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, muffler, oil pressure switches, and shaft variations are available as an option.

Cylinder bore and piston stroke are 78.0 mm (3.07 in) and 76.0 mm (2.99 in), respectively. Compression ratio rating is 8.2:1. The FX651V engine produced 19.2 PS (14.1 KW; 18.8 HP) at 3,600 rpm or 20.8 PS (15.3 KW; 20.5 HP) at 3,600 rpm of maximum horsepower and 53.4 Nm (5.5 kg·m; 39.4 ft·lb) at 1,800 rpm or 52.9 Nm (5.4 kg·m; 39.0 ft·lb) at 2,200 rpm of torque.

General information

Engine Specifications
ModelFX651V
Type4-stroke, OHV, V-twin 90°
Displacement726 cm 3 (44.3 cu-in)
Max. horsepower 19.2 PS (14.1 KW; 18.8 HP) at 3,600 rpm
20.8 PS (15.3 KW; 20.5 HP) at 3,600 rpm
Max. torque (crank PTO) 53.4 Nm (5.5 kg·m; 39.4 ft·lb) at 1,800 rpm
52.9 Nm (5.4 kg·m; 39.0 ft·lb) at 2,200 rpm
CarburetorInternally vented with fuel shut-off solenoid
Cooling systemAir-cooling
Ignition systemElectronic spark ignition
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

Dimensions and Weight

Kawasaki FX651V
Length, mm (in)479 (18.9)
Width, mm (in)462 (18.2)
Height, mm (in)565 (22.2)
Dry weight, kg (lb)46.0 (101.4)

Tightening torque specs

Tightening torque specs
Cylinder head46 Nm; 4.6 kg·m; 33.9 ft·lb
Connecting rod10 Nm; 1.0 kg·m; 7.4 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Crankcase cover27.5 Nm; 2.75 kg·m; 20.3 ft·lb
Intake manifold9 Nm; 0.9 kg·m; 6.6 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8.1 ft·lb

Maintenance data

Engine
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: 2.1 litre
Without oil filter: 1.8 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
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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.

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