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 modelK660
Engine type4-stroke, L-head (side valve), two-cylinders
Displacement1,101 cm3, (67.2 cu·in)
Max. horsepower27.2 PS (20.0 kW; 27.0 HP) at 3,600 rpm
Max. torque58 N·m (5.9 kg·m, 42.7 ft·lb) at 3,000 rpm
Cooling systemForced air
Lubricating systemPressurized by gear pump
Ignition systemMagneto ignition system
Fuel systemDowndraft carburetor
Starting systemElectric starter
GovernorCentrifugal governor
Dry weight85.0 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)
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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