Kawasaki FD620D

The Kawasaki FD620D is a 0.6 l (617 cc, 37.7 cu-in) V-twin 90° liquid-cooled 4-stroke internal combustion small gasoline motor with horisontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FD620D has OHV (overhead valve design); cast-iron cylinder liners; twin-barrel carburetor; electromagnetic in-line fuel pump; full transistor ignition system with fixed timing; dual-stage air cleaner; mechanical governor; pressure feed lubrication system with positive displacement pump; 12-volt charging system and electric starter.

The Kawasaki FD620D develops 19 PS (14 kW; 18.7 HP) at 3,600 rpm and 44.6 Nm (4.55 kg·m; 32.91 ft·lb) at 2,200 rpm of torque. Bore and stroke are 76.0 mm (2.99 in) and 68.0 mm (2.68 in), respectively.

General information

Engine Specifications
Model	FD620D
Type	4-stroke, OHV, V-twin 90°
Displacement	617 cm 3 (37.7 cu-in)
Max. horsepower	19 PS (14 KW; 18.8 HP) at 3,600 rpm
Max. torque (crank PTO)	44.6 Nm (4.55 kg·m; 32.91 ft·lb) at 2,200 rpm
Carburetor	Twin barrel
Cooling system	Liquid-cooling
Ignition system	Transistorized ignition
Lubricating system	Pressure feed lubrication system
Starting system	Electric starter
Charging system	12 Volt – 20 or 30 amps with regulator
Fuel used	Unleaded gasoline (octane number 86 or higher)
Cooling system	Pressurized forced circulation type

Dimensions and Weight

	FD620D
Length, mm (in)	556 (21.9)
Width, mm (in)	448 (17.6)
Height, mm (in)	624 (24.6)
Dry weight, kg (lb)	41.5 (91.5)

Cylinder Block and Head

Cylinder block
Compression ratio:		9.0:1
Bore x stroke:		76.0 x 68.0 mm (2.99 x 2.68 in)
Cylinder internal diameter (standard):		76.067 mm (2.9948 in)
Piston skirt outer diameter (standard):		75.875 mm (2.9872 in)
Number of piston rings (compression / oil):		2/1
Connecting rod small end diameter (standard):		17.051 mm (0.6713 in)
Piston pin diameter:		16.975 mm (0.6683 in)
Side clearance:	Top	0.150 mm (0.0059 in)
	Second	0.120 mm (0.0047 in)
Ring end gap:	Top	1.200 mm (0.0472 in)
	Second	1.200 mm (0.0472 in)
Ring width:	Top	1.120 mm (0.0441 in)
	Second	1.120 mm (0.0441 in)
	Oil	1.500 mm (0.0591 in)
Cylinder head
Valve arrangement:		OHV
Valves:		2,(4 valves in total)
Valve steam diameter:	INTAKE	5.945 mm (0.2341 in)
	EXHAUST	5.925 mm (0.2333 in)
Valve spring free length:	INTAKE	29.70 mm (1.1693 in)
	EXHAUST	29.70 mm (1.1693 in)

Maintenance data

Engine
Idle speed	1500 ± 100 rpm
Cylinder compression	12.0 kg/cm2 (170 psi) at 500 rpm
Valve clearance
Intake valve	0.25 mm (0.010 in)
Exhaust valve	0.25 mm (0.010 in)
Oil system
Oil type	4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oil	SAE 10W-40, 10W-30, 5W-20
Oil capacity (without filter changed)	1.5 L (3.17 US pt)
Oil capacity (with filter changed)	1.8 L (3.80 US pt)
Oil pressure (min)	2.8 kg/cm2 (40 psi)
Cooling system
Coolant capacity	2.7 L (0.7 US gallon)
Thermostat
Valve opening temperature	63-66° C (145-150° F)
Valve full openning lift	7 mm (0.28 in) at 80° C (176° F)
Thermoswitch
Detect temperature	110° ± 2° C (226° ± 36° C)
Ignition system
Spark plug	NGK: BMR4A
Spark plug gap	0.6-0.7 mm (0.024-0.028 in)
Starter motor
Brush length	10 mm (0.40 in), limit: 6.0 mm (0.24 in)