Kawasaki FH641D

Kawasaki FH641DThe Kawasaki FH641D is a 0.68 l (675 cc, 41.19 cu-in) V-twin 90° air-cooled 4-stroke internal combustion small gasoline motor with horizontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FH641D has OHV (overhead valve design); cast-iron cylinder liners; twin-barrel, float type carburetor with fixed main jet; pulse type fuel pump; flywheel magneto transistor type ignition system; mechanical governor and low tone muffler. The Kawasaki FH641D uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

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

The Kawasaki FH641D develops 21.4 PS (15.7 kW; 21.0 HP) at 3,600 rpm and 52.1 Nm (5.3 kg·m; 38.4 ft·lb) at 2,400 rpm of torque. It has a 75.2 mm (2.96 in) cylinder bore and 76.0 mm (2.99 in) piston stroke. Compression ratio rating is 8.1:1.

General information

Engine Specifications
ModelFH641D
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-cooled
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 FH641D
Length, mm (in)447.5 (17.6)
Width, mm (in)430 (16.9)
Height, mm (in)492 (19.4)
Dry weight, kg (lb)44.0 (97.0)

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)1.6 L
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
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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