Kawasaki FD661D

Kawasaki FD661DThe Kawasaki FD661D is a 0.62 l (617 cc, 37.65 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 FD661D has OHV (overhead valve design); cast-iron cylinder liners; float type carburetor with fixed main jet; transistorized fuel pump; full transistor ignition system with fixed timing; mechanical governor and low tone muffler. The Kawasaki FD661D uses a full pressure lubrication system with spin-on oil filter and dual element air cleaner.

The engine was equipped with solenoid shift-type electric starter and 12V-20A charging coil with a regulator.

The Kawasaki FD661D develops 22.3 PS (16.4 kW; 22.0 HP) at 3,600 rpm and 45.7 Nm (4.66 kg·m; 33.73 ft·lb) at 2,400 rpm of torque. It has a 76.0 mm (2.99 in) cylinder bore and 68.0 mm (2.68 in) piston stroke. Compression ratio rating is 10.3:1.

General information

Engine Specifications
Model FD661D
Type 4-stroke, OHV, V-twin 90°
Displacement 617 cm 3 (37.65 cu-in)
Max. horsepower 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm
Max. torque (crank PTO) 45.7 Nm (4.66 kg·m; 33.73 ft·lb) at 2,800 rpm
Carburetor Float type
Cooling system Liquid-cooling
Ignition system Transistorized ignition
Lubricating system Pressure feed lubrication system
Starting system Electric starter
Charging system 12 Volt – 20A with regulator
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel consumption 230 g/HPh
Cooling system Pressurized forced circulation type

Dimensions and Weight

Kawasaki FD661D
Length, mm (in) 556 (21.9)
Width, mm (in) 437 (17.2)
Height, mm (in) 586 (23.0)
Dry weight, kg (lb) 47.2 (104.1)

Tightening torque specs

Tightening torque specs
Cylinder head 21 Nm; 2.1 kg·m; 15.5 ft·lb
Connecting rod 21 Nm; 2.1 kg·m; 15.5 ft·lb
Flywheel 110 Nm; 11.2 kg·m; 81 ft·lb
Crankcase cover 25 Nm; 2.5 kg·m; 18.4 ft·lb
Intake manifold 8 Nm; 8.0 kg·m; 6 ft·lb
Oil drain plug 23 Nm; 2.3 kg·m; 17 ft·lb
Valve clearance lock nut 8.8 Nm; 0.9 kg·m; 6.5 ft·lb

Maintenance data

Maximum speed 3500 ± 100 rpm
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 (with filter changed) 1.5 L (1.6 US qt)
Ignition system
Spark plug NGK: BPR5ES
Spark plug gap 0.6-0.7 mm (0.024-0.028 in)
Spark plug tightening torque 15 Nm; 1.5 kg·m; 11 ft·lb
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  1. What is the most common cause of the engine surging and running ruff once it’s warmed up

  2. Looking for wiring diagram for this engine FD661D, in particular, the voltage regulator. Original connector is falling apart. 6 pins.

      • If you haven’t found one yet go to Ventrac website and look for Manuel’s then go to the 4000 model tractor (it has been discontinued) and download the Manuel the Kawasaki FD661D wiring diagram will be one of the first things in that Manuel.

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