Kohler K181

Kohler K181The Kohler K181 is a 305 cc (18.6 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from K-series, manufactured by Kohler Co.

The Kohler K181 engine has an L-head (side valve) design and horizontal PTO-shaft. This engine can be equipped with Kohler or Walbro carburetor and magneto, battery or breakerless ignition systems. The K181 engine used paper air cleaner (oiled foam pre-cleaner was available as an option).

The cylinder bore is 74.62 mm (2.94 in) and the piston stroke is 69.85 mm (2.75 in). This engine produced 8.2 PS (6.0 kW; 8.0 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

  • K – K-series
  • 18 – Approximate daisplacement (cu·in)
  • 1 – Single cylinder
  • Suffix (engine is available with the following options):
    S – Electric starter;
    T – Retractable starter;
    ST – Electric and retractable starter;
    EP – Electric plant;
    A – Special oil pan;
    C – Clutch model;
    G – Generator applications;
    P – Pump model;
    Q – Quled model;
    R – Reduction gear;

General information

Engine Specifications
ModelK181
Type4-stroke, L-head, single cylinder
Displacement308 cm 3 (18.6 cu-in)
Max. horsepower8.2 PS (6.0 kW; 8.0 HP) at 3,600 rpm
Max. torque (crank PTO)
Fuel systemCarburetor (Kohler or Walbro, fixed main jet or adjustable main jet)
Cooling systemForced-air
Ignition systemMagneto or battery or breakerless ignition system
Lubricating systemSplash type
Starting systemRecoil or electric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke74.62 X 69.85 mm (2.94 x 2.75 in)
Sleeve internal diameter74.6252-74.5998 mm (2.938-2.937 in)
Piston skirt outer diameter74.4143-74.3737 mm (2.9297-2.9281 in)
Number of piston rings (compression / oil):2 / 1
Ring end gapTop0.177-0.432 mm (0.007-0.017 in)
Second0.177-0.432 mm (0.007-0.017 in)
Connecting rod small end ID15.8877-15.8953 mm (0.6255-0.6258 in)
Piston pin outer diameter15.8673-15.8724 mm (0.6247-0.6249 in)
Cylinder Head
Valve Arrangement:L-head (sidevalve)
Valves:2
Valve head diameter:INTAKE34.925 mm (1.375 in)
EXHAUST28.575 mm (1.125 in)
Stem outer diameter (standard):INTAKE7.886-7.899 mm (0.3105-0.311 in)
EXHAUST7.848-7.861 mm (0.309-0.3095 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt20-27 Nm; 2.0-2.7 kg·m; 15-20 ft·lb
Flywheel115-122 Nm; 11.7-12.3 kg·m; 85-90 ft·lb
Spark plug25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb

Service Information

Engine
Max speed3,600 rpm
Valve clearance
Intake valve clearance0.15-0.20 mm (0.0059-0.0079 in)
Exhaust valve clearance0.43-0.48 mm (0.0169-0.0189 in)
Oil system
Oil typeAPI SF or SG
Recommended oil Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity1.2 L (1.27 US. qt, 1.06 Imp. qt.)
Ignition system
Spark plugChampion: RJ8C
Spark plug gap0.65 mm (0.0256 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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