The Kawasaki FD661D is a 617 cc, (37.7 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.
A 76.0 mm (2.99 in) cylinder bore and 68.0 mm (2.68 in) piston stroke give the FD661D engine a total of 617 cc of displacement. The compression ratio rating is 9.0:1.
The Kawasaki FD661D engine produced 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm of maximum output power and 45.7 Nm (4.66 kg·m; 33.73 ft·lb) at 2,800 rpm of peak torque.
The Kawasaki FD661D features:
- OHV design
- Transistorized ignition system
- Down draft, twin-barrel carburetor
- Centrifugal governor
- Pressurised lubrication system
- Liquid-cooled cooling system
- Electric starter (shift type)
General information
| Engine Specifications | |
| Engine model | FD661D |
| Engine type | 4-stroke, V-twin 90° |
| Displacement | 617 cm3, (37.65 cu·in) |
| Max. horsepower | 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm |
| Max. torque | 45.7 Nm (4.66 kg·m; 33.73 ft·lb) at 2,800 rpm |
| Cooling system | Liquid-cooled |
| Air cleaner | Dual stage element (foam and paper) |
| Lubricating system | Pressurised |
| Ignition system | Transistorized ignition |
| Fuel system | Down draft, twin barrel carburetor |
| Fuel tank capacity | 20.0 L (5.28 US. gal. 4.4 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter (shift type) |
| Governor | All speed mechanical governor |
| Charging system | 12V 20/30A with regulator |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 555 x 450 x 624 mm (21.9 x 17.7 x 24.6 in) |
| Dry weight | 41.5 kg (91.5 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 9.0:1 |
| Cylinder bore: | 76.0 mm (2.99 in) |
| Piston stroke: | 68.0 mm (2.68 in) |
| Cylinder internal diameter (standard): | 76.067 mm (2.9948 in) |
| Piston skirt outer diameter (standard): | 75.875 mm (2.9872 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 17.051 mm (0.6713 in) |
| Piston pin diameter: | 16.975 mm (0.6683 in) |
| Side clearance (Top): | 0.150 mm (0.0059 in) |
| Side clearance (Second): | 0.120 mm (0.0047 in) |
| Ring end gap (Top): | 1.200 mm (0.0472 in) |
| Ring end gap (Second): | 1.200 mm (0.0472 in) |
| Ring width (Top): | 1.120 mm (0.0441 in) |
| Ring width (Second): | 1.120 mm (0.0441 in) |
| Ring width (Oil): | 1.500 mm (0.0591 in) |
| Cylinder head | |
| Valve arrangement: | OHV (overhead valves) |
| Valves: | 2 (4 valves in total) |
| Valve steam diameter (INTAKE): | 5.945 mm (0.2341 in) |
| Valve steam diameter (EXHAUST): | 5.925 mm (0.2333 in) |
| Valve spring free length (INTAKE): | 29.70 mm (1.1693 in) |
| Valve spring free length (EXHAUST): | 29.70 mm (1.1693 in) |
| Cam lobe height (INTAKE): | 25.21 mm (0.9930 in) |
| Cam lobe height (EXHAUST): | 25.46 mm (1.0020 in) |
| Camshaft journal diameter: | PTO side: 15.907 mm (0.6263 in) Flywheel side: 15.917 mm (0.6267 in) |
Tightening torque specs
| Tightening torque specs | Cylinder head | 21 Nm; 2.1 kg·m; 15.5 ft·lb |
| Connecting rod | 21 Nm; 2.1 kg·m; 15.5 ft·lb |
| Flywheel | 110.0 Nm; 11.22 kg·m; 81.18 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 | 23.0 Nm; 2.35 kg·m; 17.0 ft·lb |
| Valve clearance lock nut | 8.8 Nm; 0.9 kg·m; 6.5 ft·lb |
Service Data
| Engine | |
| Maximum speed: | 1500±100 rpm |
| Cylinder compression: | 14.0 kg/cm2 (213 psi) at 500 rpm |
| Valve clearance | |
| Intake valve clearance (COLD): | 0.25 mm (0.0098 in) |
| Exhaust valve clearance (COLD): | 0.25 mm (0.0098 in) |
| Oil system | |
| Lubrication system: | Pressurised |
| Oil type: | SG, or SH |
| Recommended oil: | SAE 10W-40, 10W-30, 5W-20 |
| Oil capacity: | W/o filter changed: 1.5 L (1.6 US. qt, 1.3 Imp. qt.) With filter changed: 1.8 L (1.9 US. qt, 1.6 Imp. qt.) |
| Oil pressure (min): | 2.8 kg/cm2 (40 psi) |
| Oil filter: | Cartridge type full flow |
| Fuel system | |
| Type: | Down draft, twin-barrel carburetor with fixed main jet |
| Model: | TEIKEI/FD22K-1K |
| Main bore diameter: | 26.0 mm (1.20 in) |
| Venturi diameter: | 22.0 mm (0.87 in) |
| Main jet: | #110 |
| Pilot jet: | #58 |
| Main air jet: | #1.4 |
| Pilot air jet: | #0.8 |
| Pilot screw: | 1-1/4±1/4 turns out |
| Float level: | 19.0-21.0 mm (0.7480-0.8260 in) |
| Fuel pump: | Electro-magnetic pump (in-line type) |
| Fuel filter: | Replaceable paper element |
| Ignition system | |
| Type: | Transistorized ignition |
| Spark plug: | NGK BMR4A |
| Spark plug gap: | 0.6-0.7 mm (0.0236-0.0276 in) |
| Cooling system | |
| Type | Pressurized forced circulation type |
| Coolant capacity | 2.7 liters (0.7 US gal, 0.6 Imp. gal) |
| Thermostat | |
| Valve opening temperature | 63-66° C (145-150° F) |
| Valve full openning lift | 7.0 mm (0.28 in) at 80° C (176° F) |
| Thermoswitch | |
| Detect temperature | 110° ± 2° C (226° ± 36° C) |
| Starter motor | |
| Brush length | 10 mm (0.40 in), limit: 6.0 mm (0.24 in) |
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