Kawasaki FD671D

Kawasaki FD671DThe Kawasaki FD671D is a 0.75 l (745 cc, 45.46 cu-in) V-twin 90° liquid-cooled 4-stroke internal combustion small gasoline motor with horizontal shaft, manufactured by Kawasaki Heavy Industries LTd., for general-purpose applications.

The FD671D 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 FD671D 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 FD671D develops 20.8 PS (15.3 kW; 20.5 HP) at 3,600 rpm and 50.0 Nm (5.1 kg·m; 36.9 ft·lb) at 2,400 rpm of torque. Bore and stroke are 78.0 mm (3.07 in) and 78.0 mm (3.07 in), respectively. Compression ratio rating is 8.0:1.

General information

Engine Specifications
ModelFD671D
Type4-stroke, OHV, V-twin 90°
Displacement745 cm 3 (45.46 cu-in)
Max. horsepower20.8 PS (15.3 kW; 20.5 HP) at 3,600 rpm
Max. torque (crank PTO)50.0 Nm (5.1 kg·m; 36.9 ft·lb) at 2,400 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

Tightening torque specs

Tightening torque specs
Cylinder head27 Nm; 2.7 kg·m; 20 ft·lb
Connecting rod21 Nm; 2.1 kg·m; 15.5 ft·lb
Flywheel56 Nm; 5.5 kg·m; 41 ft·lb
Crankcase cover22 Nm; 2.2 kg·m; 16.2 ft·lb
Intake manifold12 Nm; 1.2 kg·m; 9 ft·lb
Oil drain plug25 Nm; 2.5 kg·m; 18.5 ft·lb
Valve clearance lock nut11 Nm; 1.1 kg·m; 8 ft·lb

Maintenance data

Engine
Maximum speed3500 ± 100 rpm
Idle speed1500 ± 100 rpm
Cylinder compression7.2 kg/cm2 (102 psi) at 500 rpm
Valve clearance
Intake valve0.15 mm (0.006 in)
Exhaust valve0.15 mm (0.006 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)1.8-2.0 L (1.9-2.1 US qt)
Ignition system
Spark plugNGK: BPR2ES
Spark plug gap0.75 mm (0.03 in)
Spark plug tightening torque25 Nm; 2.5 kg·m; 18.5 ft·lb
Ignition coil air gap0.25-0.40 mm (0.009-0.015 in)
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