The 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 | |
| Model | FD671D |
| Type | 4-stroke, OHV, V-twin 90° |
| Displacement | 745 cm 3 (45.46 cu-in) |
| Max. horsepower | 20.8 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 |
| 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 |
Tightening torque specs
| Tightening torque specs | Cylinder head | 27 Nm; 2.7 kg·m; 20 ft·lb |
| Connecting rod | 21 Nm; 2.1 kg·m; 15.5 ft·lb |
| Flywheel | 56 Nm; 5.5 kg·m; 41 ft·lb |
| Crankcase cover | 22 Nm; 2.2 kg·m; 16.2 ft·lb |
| Intake manifold | 12 Nm; 1.2 kg·m; 9 ft·lb |
| Oil drain plug | 25 Nm; 2.5 kg·m; 18.5 ft·lb |
| Valve clearance lock nut | 11 Nm; 1.1 kg·m; 8 ft·lb |
Maintenance data
| Engine | |
| Maximum speed | 3500 ± 100 rpm |
| Idle speed | 1500 ± 100 rpm |
| Cylinder compression | 7.2 kg/cm2 (102 psi) at 500 rpm |
| Valve clearance | |
| Intake valve | 0.15 mm (0.006 in) |
| Exhaust valve | 0.15 mm (0.006 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) | 1.8-2.0 L (1.9-2.1 US qt) |
| Ignition system | |
| Spark plug | NGK: BPR2ES |
| Spark plug gap | 0.75 mm (0.03 in) |
| Spark plug tightening torque | 25 Nm; 2.5 kg·m; 18.5 ft·lb |
| Ignition coil air gap | 0.25-0.40 mm (0.009-0.015 in) |
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