The Kohler K241 is a 391 cc, (23.9 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.
An 82.6 mm (3.25 in) cylinder bore and 73.0 mm (2.87 in) piston stroke give the K241 engine a total of 391 cc of displacement. The K241 engine produced 10.2 PS (7.5 kW; 10.0 HP) at 3,600 rpm of maximum horsepower.
The Kohler K241 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 electirc starter
* – depending on modification
General information
| Engine Specifications | |
| Engine model | K241 |
| Engine type | 4-stroke, L-head (side valve), single-cylinder |
| Displacement | 391 cm3, (23.86 cu·in) |
| Max. horsepower | 10.2 PS (7.5 kW; 10.0 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 electirc starter |
| Stoping system | Ignition primary circuit ground |
| 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: | 82.6 mm (3.25 in) |
| Piston stroke: | 73.0 mm (2.87 in) |
| Cylinder internal diameter (standard): | 82.5627-82.5881 mm (3.2505-3.2515 in) |
| Piston skirt outer diameter (standard): | 82.3290-82.3773 mm (3.2413-3.2432 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod small end diameter (standard): | 21.8338-21.8415 mm (0.8596-0.8599 in) |
| Piston pin diameter: | 21.8211-21.8262 mm (0.8591-0.8593 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: | 36.5 mm (1.435 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: | API SF or SG |
| Recommended oil: | Summer: SAE 30W Winter: SAE 5W-20, 5W-30 |
| Oil capacity: | K241: 1.9 L (2.01 US. qt, 1.67 Imp. qt.) K241A: 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 | 100, 102, 104, 105, 106, 107, 108, 109, 1000 |
| J.I.Case | 220 |
| John-Deere | 110 (1968-1974), 112, 210 |
| Toro | 950 |
| Wheel Horse | Raider 10 |
References
1. Kohler K91, K141, K161, K181, K241, K301, K321, K341, service manual. Kohler Co. 1992.
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