Kawasaki FH641V

Kawasaki FH641VThe Kawasaki FH641V is a 0.68 l (675 cc, 41.19 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.

The FH641V has V-twin 90° design with cast iron cylinder liners and overhead valves (OHV). The engine is equipped with twin-barrel, float type carburetor with fixed main jet; pulse type fuel pump and flywheel magneto transistor type ignition system. The Kawasaki FH641V uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

The engine has BENDIX type electric starter and 12V-13A charging coil with a regulator.

A 75.2 mm (2.96 in) cylinder bore and 76 mm (2.99 in) piston stroke give the motor a total of 675 cc of displacement. Compression ratio rating is 8.1:1. The Kawasaki FH641V produced 21.4 PS (15.7 kW; 21.0 HP) at 3,600 rpm and 52.1 Nm (5.31 kg·m; 38.45 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
ModelFH641V
Type4-stroke, OHV, V-twin 90°
Displacement675 cm 3 (41.2 cu-in)
Max. horsepower21.4 PS (15.7 KW; 21.0 HP) at 3,600 rpm
Max. torque (crank PTO)52.1 Nm (5.3 kg·m; 38.4 ft·lb) at 2,400 rpm
CarburetorTwin barrel, float type
Cooling systemAir-cooling
Ignition systemFlywheel magneto transistor type
Lubricating systemFull pressure with spin-on oil filter
Starting systemElectric starter
Charging system12 Volt – 13A with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption245 g/HPh
Cooling systemPressurized forced circulation type

Dimensions and Weight

Kawasaki FH641V
Length, mm (in)458 (18.0)
Width, mm (in)430 (16.9)
Height, mm (in)461 (18.1)
Dry weight, kg (lb)40.0 (88.2)

Tightening torque specs

Tightening torque specs
Cylinder head28 Nm; 2.8 kg·m; 20.6 ft·lb
Connecting rod10 Nm; 1.0 kg·m; 7 ft·lb
Flywheel56 Nm; 5.7 kg·m; 41.3 ft·lb
Intake manifold6 Nm; 0.6 kg·m; 4.4 ft·lb
Valve clearance lock nut7 Nm; 0.7 kg·m; 5.1 ft·lb

Maintenance data

Engine
Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression3.9 kg/cm2 (56 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 (SF, SG, SH, or SJ )
Recommended oilSAE 10W-40, 10W-30, 5W-20
Oil capacity (with filter changed)1.8 litre (1.9 US.qt.)
Ignition system
Spark plugNGK: BPR4ES
Spark plug gap0.75 mm (0.029 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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