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)
Author:Sergei WersAbout: 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.
7 Comments
I have a 3000 Kawasaki Mule was running great now 1 cyliderwill not fire I put new spark plugs in it and still will not fire any ideas ???
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
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. 
Author:
I have a 3000 Kawasaki Mule was running great now 1 cyliderwill not fire I put new spark plugs in it and still will not fire any ideas ???
hope you figuerd it all out because its been three dam years.. check the cylinder coil thats my guess bud good luck ..
Crank sensor
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
I need to replace a piston liner… where can i get oem…
The sparkplug listed above in the engine specifications is wrong. The plug is too short and will burn a hole in the top of the piston!!!
This information is from the official service manual