Kawasaki FD620D

Kawasaki FD620DThe 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
ModelFD620D
Type4-stroke, OHV, V-twin 90°
Displacement617 cm 3 (37.7 cu-in)
Max. horsepower19 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
CarburetorTwin barrel
Cooling systemLiquid-cooling
Ignition systemTransistorized ignition
Lubricating systemPressure feed lubrication system
Starting systemElectric starter
Charging system12 Volt – 20 or 30 amps with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Cooling systemPressurized 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:Top0.150 mm (0.0059 in)
Second0.120 mm (0.0047 in)
Ring end gap:Top1.200 mm (0.0472 in)
Second1.200 mm (0.0472 in)
Ring width:Top1.120 mm (0.0441 in)
Second1.120 mm (0.0441 in)
Oil1.500 mm (0.0591 in)
Cylinder head
Valve arrangement:OHV
Valves:2,(4 valves in total)
Valve steam diameter:INTAKE5.945 mm (0.2341 in)
EXHAUST5.925 mm (0.2333 in)
Valve spring free length:INTAKE29.70 mm (1.1693 in)
EXHAUST29.70 mm (1.1693 in)

Maintenance data

Engine
Idle speed1500 ± 100 rpm
Cylinder compression12.0 kg/cm2 (170 psi) at 500 rpm
Valve clearance
Intake valve0.25 mm (0.010 in)
Exhaust valve0.25 mm (0.010 in)
Oil system
Oil type4-stroke or an equivalent (SC, SD, SE, SF, SG, or SH)
Recommended oilSAE 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 capacity2.7 L (0.7 US gallon)
Thermostat
Valve opening temperature63-66° C (145-150° F)
Valve full openning lift7 mm (0.28 in) at 80° C (176° F)
Thermoswitch
Detect temperature110° ± 2° C (226° ± 36° C)
Ignition system
Spark plugNGK: BMR4A
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
Starter motor
Brush length10 mm (0.40 in), limit: 6.0 mm (0.24 in)
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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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.

5 Comments

  1. I am looking for a carburator for a John Deere gator hpx 4×4 with a 617cc liquid cooled Kawasaki vtwin . The stock carb is a mikuni but is bad . Do you carry a replacement carb for this application? Tha ks

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