Kohler K90

Kohler K90The Kohler K90 is a 145 cc (8.86 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from K-series, manufactured by Kohler Co.

The Kohler K90 engine has an aluminum cylinder head, cast-iron cylinder liners, and horizontal PTO-shaft. The engine used heat-treated alloy steel forging crankshaft with integral counterweight and anti-friction ball bearings on both sides of the crankshaft, aluminum alloy connecting rod and low expansion aluminum alloy pistons. This engine was equipped with float feed, adjustable type carburetor, and high-voltage flywheel magneto ignition. The K90 engine used an oil bath air cleaner.

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

The breakdown of the engine code is as follows:

  • K – K-series
  • 9 – Approximate daisplacement (cu·in)
  • Suffix (engine is available with the following options):
    T – Retractable starter;
    P – Pump model;
    R – Reduction gear (6:1);

General information

Engine Specifications
Type4-stroke, L-head, single cylinder
Displacement145 cm 3 (8.86 cu-in)
Max. horsepower3.7 PS (2.7 kW; 3.6 HP) at 3,600 rpm
Max. torque (crank PTO)
Fuel systemCarburetor
Cooling systemForced-air
Ignition systemMagneto ignition system
Lubricating systemSplash type
Starting system
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2/3 gal.

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke60.33 X 50.80 mm (2.375 x 2.000 in)
Number of piston rings (compression / oil):2 / 1
Cylinder Head
Valve Arrangement:L-head (sidevalve)

Service Information

Max speed3,600 rpm
Oil system
Oil typeAPI SF or SG
Recommended oil Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity1 1/2 pints
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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