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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