Kohler K90

Kohler K90The Kohler K90 is a 145 cc, (8.85 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kohler CO., for general-purpose applications.

Cylinder bore and piston stroke are 60.33 mm (2.38 in) and 50.80 mm (2 in), respectively. This engine produced 3.7 PS (2.7 kW; 3.6 HP) at 3,600 rpm of horsepower.

The Kohler K90 features:

  • L-head (sidevalve) design
  • Magneto ignition system
  • Carburetor
  • Centrifugal governor
  • Splash type lubrication system
  • Forced air cooling system
  • Retractable starter

General information

Engine Specifications
Engine model K90
Engine type 4-stroke, L-head, single-cylinder
Displacement 145 cm3, (8.85 cu·in)
Max. horsepower 3.7 PS (2.7 kW; 3.6 HP) at 3,600 rpm
Max. torque
Cooling system Forced air
Lubricating system Splash type
Ignition system Magneto ignition system
Fuel system Carburetor
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Retractable starter
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H)
Dry weight 19.5 kg (43 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore: 60.33 mm (2.38 in)
Piston stroke: 50.80 mm (2 in)
Cylinder internal diameter (standard): 60.312-60.337 mm (2.3745-2.3755 in)
Piston skirt outer diameter (standard): 60.172-60.223 mm (2.369-2.371 in)
Number of piston rings (compression / oil): 2/1
Cylinder head
Valve arrangement: L-head (side valve)
Valves: 2

Service Data

Engine
Maximum speed: 3,600 rpm
Valve clearance
Intake valve clearance: 0.13-0.23 mm (0.0051-0.0091 in)
Exhaust valve clearance: 0.28-0.38 mm (0.011-0.015 in)
Oil system
Lubrication system: Splash type
Oil type: API SF or SG
Recommended oil: Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity: 0.7 L (0.74 US. qt, 0.62 Imp. qt.)
Fuel system
Type: Carburetor
Ignition system
Type: Magneto ignition system
Spark plug: Champion RJ8C
Spark plug gap: 0.65 mm (0.0256 in)

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