Kohler K181

Kohler K181The 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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