Kawasaki FD501D

Kawasaki FD501DThe 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

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)
ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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