The 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 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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