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 modelFD501D
Engine type4-stroke, OHV, V-twin 90°
Displacement437 cm3, (26.7 cu·in)
Max. horsepower16.2 PS (11.9 kW; 16 HP) at 3,600 rpm
Max. torque32.6 N·m (3.3 kg·m, 24 ft·lb) at 2,800 rpm
Cooling systemLiquid cooled
Air cleanerDual stage element
Lubricating systemFull pressure
Ignition systemBattery, full transistor with fixed timing type
Fuel systemFloat type carburetor
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity7.5 liters (2.0 US gal, 1.6 Imp. gal)
Starting systemElectric starter
Stoping systemIgnition primary circuit ground
GovernorMechanical governor
PTO shaft rotationCounterclockwise (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 weight35.2 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 head21 Nm; 2.1 kg·m; 15.5 ft·lb
Connecting rod12 Nm; 1.2 kg·m; 9 ft·lb
Flywheel88 Nm; 9.0 kg·m; 65 ft·lb
Crankcase cover21 Nm; 2.1 kg·m; 15.5 ft·lb
Intake manifold8 Nm; 8.0 kg·m; 6 ft·lb
Oil drain plug25 Nm; 2.5 kg·m; 18.5 ft·lb
Valve clearance lock nut8.8 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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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