Kohler K660

Kohler K660The Kohler K660 is a 1.1 L (1,101 cc, 67.2 cu·in) natural aspirated, two-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by engine division of Kohler Co., for general-purpose applications.

The cylinder bore is 92.0 mm (3.62 in) and the piston stroke is 82.5 mm (3.25 in). This engine produced 27.2 PS (20.0 kW; 27.0 HP) at 3,600 rpm of horsepower and 58 N·m (5.9 kg·m, 42.7 ft·lb) at 3,000 rpm of torque.

The Kohler K660 features:

  • L-head (side valve) design
  • Magneto ignition system
  • Downdraft carburetor
  • Centrifugal governor
  • Pressurized lubrication system by gear pump
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model K660
Engine type 4-stroke, L-head (side valve), two-cylinders
Displacement 1,101 cm3, (67.2 cu·in)
Max. horsepower 27.2 PS (20.0 kW; 27.0 HP) at 3,600 rpm
Max. torque 58 N·m (5.9 kg·m, 42.7 ft·lb) at 3,000 rpm
Cooling system Forced air
Lubricating system Pressurized by gear pump
Ignition system Magneto ignition system
Fuel system Downdraft carburetor
Starting system Electric starter
Governor Centrifugal governor
Dry weight 85.0 kg (187.4 lbs)

Cylinder Block and Head

Cylinder block
Cylinder bore: 92.0 mm (3.62 in)
Piston stroke: 82.5 mm (3.25 in)
Cylinder internal diameter (standard): 92.0877-92.0623 mm (3.6255-3.6245 in)
Piston skirt outer diameter (standard): 92.0496-92.0369 mm (3.624-3.6235 in)
Number of piston rings (compression / oil): 2/1
Connecting rod small end diameter (standard): 22.2352-22.2402 mm (0.8754-0.8756 in)
Piston pin diameter: 22.2225-22.2275 mm (0.8749-0.8751 in)
Ring end gap (Top): 0.254-0.508 mm (0.01-0.02 in)
Ring end gap (Second): 0.254-0.508 mm (0.01-0.02 in)
Crankshaft main journal diameter: 57.1754-57.1881 mm (2.251-2.2515 in)
Crankpin journal diameter: 47.6123-47.6250 mm (1.8745-1.875 in)
Crankshaft center distance: 41.25 mm (1.625 in)
Cylinder head
Valve arrangement: L-head (side valve)
Valves: 2, (4 valves in total)
Valve steam diameter (INTAKE): 7.8867-7.8994 mm (0.3105-0.311 in)
Valve steam diameter (EXHAUST): 7.8334-7.8511 mm (0.3084-0.3091 in)

Service Data

Maximum speed: 3,600 rpm
Valve clearance
Intake valve clearance (COLD): 0.20-0.25 mm (0.0079-0.0098 in)
Exhaust valve clearance (COLD): 0.43-0.48 mm (0.0169-0.0189 in)
Oil system
Lubrication system: Pressurized
Oil type: SF or SG
Recommended oil: Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity: 3.3 L (3.49 US. qt, 2.9 Imp. qt.)
Fuel system
Type: Downdraft carburetor
Ignition system
Type: Magneto ignition system
Spark plug: Champion RCJ-8
Spark plug gap: 0.65 mm (0.0256 in)
Spark plug torque: 27 N·m (2.8 kg·m, 19.9 ft·lb)