The Kohler K181 is a 305 cc, (18.6 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kohle Co., for general-purpose applications.
A 74.62 mm (2.94 in) cylinder bore and 69.85 mm (2.75 in) piston stroke give the K181 engine a total of 305 cc of displacement. The K181 engine produced 8.2 PS (6.0 kW; 8.0 HP) at 3,600 rpm of maximum horsepower.
The Kohler K181 features:
- L-head (side valve) design
- Magneto ignition system, battery ignition system, breakerless ignition system ignition system*
- Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet)*
- Centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Retractable or electric starter
*- depending on modification
General information
| Engine Specifications | |
| Engine model | K181 |
| Engine type | 4-stroke, L-head (side valve), single-cylinder |
| Displacement | 305 cm3, (18.6 cu·in) |
| Max. horsepower | 8.2 PS (6.0 kW; 8.0 HP) at 3,600 rpm |
| Max. torque | – |
| Cooling system | Forced air |
| Air cleaner | Paper air cleaner (oiled foam precleaner) |
| Lubricating system | Splash type |
| Ignition system | Magneto ignition system, battery ignition system, breakerless ignition system |
| Fuel system | Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet) |
| Fuel consumption | – |
| Fuel tank capacity | – |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Retractable or electric starter |
| Governor | Centrifugal governor |
| Dimensions (L x W X H) | – |
| Dry weight | 29.5 kg (65 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | – |
| Cylinder bore: | 74.62 mm (2.94 in) |
| Piston stroke: | 69.85 mm (2.75 in) |
| Cylinder internal diameter (standard): | 74.6252-74.5998 mm (2.938-2.937 in) |
| Piston skirt outer diameter (standard): | 74.4143-74.3737 mm (2.9297-2.9281 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 15.8877-15.8953 mm (0.6255-0.6258 in) |
| Piston pin diameter: | 15.8673-15.8724 mm (0.6247-0.6249 in) |
| Ring end gap (Top): | 0.177-0.432 mm (0.007-0.017 in) |
| Ring end gap (Second): | 0.177-0.432 mm (0.007-0.017 in) |
| Crankshaft center distance: | 34.925 mm (1.375 in) |
| Cylinder head | |
| Valve arrangement: | L-head (side valve) |
| Valves: | 2 |
| Valve head diameter (INTAKE): | 34.925 mm (1.375 in) |
| Valve head diameter (EXHAUST): | 28.575 mm (1.125 in) |
| Valve steam diameter (INTAKE): | 7.886-7.899 mm (0.3105-0.311 in) |
| Valve steam diameter (EXHAUST): | 7.848-7.861 mm (0.309-0.3095 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head bolts | 20-27 Nm (15-20 ft-lbs) |
| Flywheel | 115-122 Nm (85-90 ft-lbs) |
| Spark plug | 25-30 Nm (18-22 ft-lbs) |
| Connecting rod | 22.5 Nm (16.7 ft-lbs) |
| Governor bushing | 14.6-16.9 Nm (10.8-12.5 ft-lbs) |
| Fuel pump mounting screws | 4.2-5.1 Nm (3.1-3.8 ft-lbs) |
Service Data
| Engine | |
| Maximum speed: | 3,600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.15-0.20 mm (0.0059-0.0079 in) |
| Exhaust valve clearance: | 0.43-0.48 mm (0.0169-0.0189 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: | 1.2 L (1.27 US. qt, 1.06 Imp. qt.) |
| Fuel system | |
| Type: | Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet) |
| Ignition system | |
| Type: | Magneto ignition system, battery ignition system, breakerless ignition system |
| Spark plug: | Champion RJ8C |
| Spark plug gap: | 0.65 mm (0.0256 in) |
| Spark plug torque: | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| Cub-Cadet | 86, 800 |
| John Deere | 110 (1963-1967), 110 (1968-1974), 200, 208 |
| Wheel Horse | B-80, C-81 |
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