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
ModelFD661D
Type4-stroke, OHV, V-twin 90°
Displacement617 cm 3 (37.65 cu-in)
Max. horsepower22.3 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
CarburetorFloat type
Cooling systemLiquid-cooling
Ignition systemTransistorized ignition
Lubricating systemPressure feed lubrication system
Starting systemElectric starter
Charging system12 Volt – 20A with regulator
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption230 g/HPh
Cooling systemPressurized 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 head21 Nm; 2.1 kg·m; 15.5 ft·lb
Connecting rod21 Nm; 2.1 kg·m; 15.5 ft·lb
Flywheel110 Nm; 11.2 kg·m; 81 ft·lb
Crankcase cover25 Nm; 2.5 kg·m; 18.4 ft·lb
Intake manifold8 Nm; 8.0 kg·m; 6 ft·lb
Oil drain plug23 Nm; 2.3 kg·m; 17 ft·lb
Valve clearance lock nut8.8 Nm; 0.9 kg·m; 6.5 ft·lb

Maintenance data

Engine
Maximum speed3500 ± 100 rpm
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 (with filter changed)1.5 L (1.6 US qt)
Ignition system
Spark plugNGK: BPR5ES
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
Spark plug tightening torque15 Nm; 1.5 kg·m; 11 ft·lb
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