Kohler K241

Kohler K241The 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)

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