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 (2.00 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 modelK90
Engine type4-stroke, L-head, single-cylinder
Displacement145 cm3, (8.85 cu·in)
Max. horsepower3.7 PS (2.7 kW; 3.6 HP) at 3,600 rpm
Max. torque
Cooling systemForced air
Lubricating systemSplash type
Ignition systemMagneto ignition system
Fuel systemCarburetor
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRetractable starter
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)
Dry weight19.5 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)

Service Data

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
Ignition system
Type:Magneto ignition system
Spark plug:Champion RJ8C
Spark plug gap:0.65 mm (0.0256 in)
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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