The Kawasaki FD501D is a 437 cc, (26.7 cu·in) natural aspirated V-twin 90° four-stroke liquid cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kawasaki for general-purpose applications.
The cylinder bore and piston stroke are 67.0 mm (2.64 in) and 62.0 mm (2.44 in), respectively. The compression ratio rating is 9.3:1.
This engine produced 16.2 PS (11.9 kW; 16 HP) at 3,600 rpm of horsepower and 32.6 N·m (3.3 kg·m, 24 ft·lb) at 2,800 rpm of torque.
The Kawasaki FD501D features:
- OHV design
- Battery, a full transistor ignition system with fixed timing type
- Float type carburetor
- Centrifugal governor
- Full pressure lubrication system
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | FD501D |
| Engine type | 4-stroke, OHV, V-twin 90° |
| Displacement | 437 cm3, (26.7 cu·in) |
| Max. horsepower | 16.2 PS (11.9 kW; 16 HP) at 3,600 rpm |
| Max. torque | 32.6 N·m (3.3 kg·m, 24 ft·lb) at 2,800 rpm |
| Cooling system | Liquid cooled |
| Air cleaner | Dual stage element |
| Lubricating system | Full pressure |
| Ignition system | Battery, full transistor with fixed timing type |
| Fuel system | Float type carburetor |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 7.5 liters (2.0 US gal, 1.6 Imp. gal) |
| Starting system | Electric starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Mechanical governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 523 x 385 x 481 mm (20.6 x 15.2 x 18.9 in) |
| Dry weight | 35.2 kg (77.6 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 9.3:1 |
| Cylinder bore: | 67.0 mm (2.64 in) |
| Piston stroke: | 62.0 mm (2.44 in) |
| Cylinder internal diameter (standard): | 66.980-67.000 mm (2.637-2.6378 in) |
| Piston skirt outer diameter (standard): | 66.950-66.965 mm (2.6358-2.6364 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 15.980 mm (0.6291 in) |
| Ring groove clearance (Top): | 0.100 mm (0.0039 in) |
| Ring end gap (Top): | 1.000 mm (0.0394 in) |
| Crankshaft main journal diameter: | 29.920 mm (1.178 in) |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2,(4 valves in total) |
| Valve steam diameter (INTAKE): | 4.930 mm (0.1941 in) |
| Valve steam diameter (EXHAUST): | 4.920 mm (0.1937 in) |
| Valve spring free length (INTAKE): | 27.30 mm (1.0748 in) |
| Valve spring free length (EXHAUST): | 27.30 mm (1.0748 in) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 21 Nm; 2.1 kg·m; 15.5 ft·lb |
| Connecting rod | 12 Nm; 1.2 kg·m; 9 ft·lb |
| Flywheel | 88 Nm; 9.0 kg·m; 65 ft·lb |
| Crankcase cover | 21 Nm; 2.1 kg·m; 15.5 ft·lb |
| Intake manifold | 8 Nm; 8.0 kg·m; 6 ft·lb |
| Oil drain plug | 25 Nm; 2.5 kg·m; 18.5 ft·lb |
| Valve clearance lock nut | 8.8 Nm; 0.9 kg·m; 6.5 ft·lb |
Service Data
| Engine | |
| 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 clearance: | 0.25 mm (0.0098 in) |
| Exhaust valve clearance: | 0.25 mm (0.0098 in) |
| Oil system | |
| Lubrication system: | Full pressure |
| Oil type: | API SC, SD, SE, SF, SG, or SH |
| Recommended oil: | SAE 10W-40, 10W-30, 5W-20 |
| Oil capacity: | 1.3 L (1.37 US. qt, 1.14 Imp. qt.) |
| Fuel system | |
| Type: | Float type carburetor |
| Carburetor model: | Mikuni BV24-18 |
| Bore diameter: | 24.0 mm (0.95 in) |
| Venturi diameter: | 18.0 mm (0.71 in) |
| Main jet: | #112.5 |
| Pilot jet: | #47.5 |
| Main air jet: | 1.2 |
| Pilot air jet: | 1.0 |
| Pilot air screw: | 1-3/8 |
| Fuel pump type: | Pressure/vacuum operated diaphragm pump |
| Fuel pressure (min): | 6.12 kPa (0.9 psi) |
| Cooling system | |
| Type: | Pressurized forced circulation type |
| Coolant capacity: | 2.0 liters (2.11 US.qts, 1.76 Imp. qts) |
| Ignition system | |
| Type: | Battery, full transistor with fixed timing type |
| Spark plug: | NGK BPR4ES |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
| Spark plug torque: | 17 N·m (1.7 kg·m, 12.5 ft·lb) |
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