The Kohler K301 is a 476 cc, (29.0 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 85.7 mm (3.37 in) and 82.6 mm (3.25 in), respectively. This engine produced 12.2 PS (9.0 kW; 12.0 HP) at 3,600 rpm of horsepower.
The Kohler K301 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
General information
| Engine Specifications | |
| Engine model | K301 |
| Engine type | 4-stroke, L-head (side valve), single-cylinder |
| Displacement | 476 cm3, (29.05 cu·in) |
| Max. horsepower | 12.2 PS (9.0 kW; 12.0 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 | 53.5 kg (117.9 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | – |
| Cylinder bore: | 85.7 mm (3.37 in) |
| Piston stroke: | 82.6 mm (3.25 in) |
| Cylinder internal diameter (standard): | 85.7123-85.7377 mm (3.3745-3.3755 in) |
| Piston skirt outer diameter (standard): | 85.4710-85.5472 mm (3.365-3.368 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 22.2428-22.2504 mm (0.8757-0.876 in) |
| Piston pin diameter: | 22.2300-22.2352 mm (0.8752-0.8754 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: | 41.3 mm (1.625 in) |
| Cylinder head | |
| Valve arrangement: | L-head (side valve) |
| Valves: | 2 |
| Valve head diameter (INTAKE): | 34.798-35.052 mm (1.37-1.38 in) |
| Valve head diameter (EXHAUST): | 28.448-28.702 mm (1.12-1.13 in) |
| Valve steam diameter (INTAKE): | 7.8867-7.8994 mm (0.3105-0.311 in) |
| Valve steam diameter (EXHAUST): | 7.8334-7.8511 mm (0.3084-0.3091 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head bolts | 34-41 Nm (25-30 ft-lbs) |
| Flywheel | 68-81 Nm (50-60 ft-lbs) |
| Spark plug | 25-30 Nm (18-22 ft-lbs) |
| Connecting rod | 32.1 Nm (23.8 ft-lbs) |
| Governor bushing | 11.2-13.6 Nm (8.3-10.1 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 |
| Compression pressure | |
| Normal: | 7.7-8.4 kg/cm2 (7.6-8.3 bar, 110-120 psi) / 1,000 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.20-0.25 mm (0.0079-0.0098 in) |
| Exhaust valve clearance: | 0.43-0.48 mm (0.0169-0.0189 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | SF or SG |
| Recommended oil: |
Summer: SAE 30W Winter: SAE 5W-20, 5W-30 |
| Oil capacity: |
K301: 1.9 L (2.01 US. qt, 1.67 Imp. qt.) K301A: 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 RH10 |
| 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 | 123, 124, 125, 126, 127, 128, 129, 1200, 1282 |
| Gravely | 812 |
| John Deere | 112, 120, 140, 212, 312, 1250 |
| Wheel Horse | Charger 12, C-120 |
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