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 modelK241
Engine type4-stroke, L-head (side valve), single-cylinder
Displacement391 cm3, (23.86 cu·in)
Max. horsepower10.2 PS (7.5 kW; 10.0 HP) at 3,600 rpm
Max. torque
Cooling systemForced air
Air cleanerPaper air cleaner (oiled foam precleaner)
Lubricating systemSplash type
Ignition systemMagneto ignition system, battery ignition system, breakerless ignition system
Fuel systemCarburetor (Kohler or Walbro – fixed main jet or adjustable main jet)
Fuel consumption
Fuel tank capacity
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRetractable or electirc starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor
Dimensions (L x W X H)
Dry weight53.5 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 bolts34-41 Nm (25-30 ft-lbs)
Flywheel68-81 Nm (50-60 ft-lbs)
Spark plug25-30 Nm (18-22 ft-lbs)
Connecting rod32.1 Nm (23.8 ft-lbs)
Governor bushing11.2-13.6 Nm (8.3-10.1 ft-lbs)
Fuel pump mounting screws4.2-5.1 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 BrandModels
Lawn tractors
Cub-Cadet100, 102, 104, 105, 106, 107, 108, 109, 1000
J.I.Case220
John-Deere110 (1968-1974), 112, 210
Toro950
Wheel HorseRaider 10

References

1. Kohler K91, K141, K161, K181, K241, K301, K321, K341, service manual. Kohler Co. 1992.

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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