Kohler M18

Kohler M18The Kohler M18 is a 691 cc (41.2 cu·in) two-cylinder air-cooled four-stroke internal combustion gasoline engine from the Magnum-series, manufactured by Kohler Co.

The Kohler M18 engine has an L-head (side valve) design and a horizontal PTO shaft. This engine is equipped with the Kohler or Walbro-build carburetor and an electronic magneto ignition system. The M18 engine used a high-density paper air cleaner.

The cylinder bore is 79.0 mm (3.11 in) and the piston stroke is 70.0 mm (2.76 in). The compression ratio rating is 6.0:1. This engine produced 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

  • M – M-series
  • 18 – 18.0 HP horsepower
  • Suffix (engine is available with the following options):
    S – Electric starter;
    G – Tapered crankshaft (Generator applications);
    P – Threaded crankshaft (Pump applications);
    EP – Generator;
    Q – Quilet model;

General information

Engine Specifications
Model M16
Type 4-stroke, L-head, two-cylinder
Displacement 691 cm 3 (41.2 cu-in)
Max. horsepower 18.2 PS (13.4 kW; 18.0 HP) at 3,600 rpm
Max. torque (crank PTO)
Fuel system Carburetor
Cooling system Forced-air
Ignition system Electronic magneto ignition system
Lubricating system Splash type
Starting system Electric starter
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 5.5 L (1.45 US. gal. 1.21 Imp. gal.)

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke 79.0 mm X 70.0 mm (3.11 x 2.76 in)
Sleeve internal diameter 79.050-79.075 mm (3.1122-3.1132 in)
Piston skirt outer diameter 78.944-78.961 mm (3.108-3.1087 in)
Number of piston rings (compression / oil): 2 / 1
Ring end gap Top 0.253-0.582 mm (0.010-0.023 in)
Second 0.253-0.582 mm (0.010-0.023 in)
Connecting rod small end ID 15.825-15.833 mm (0.623-0.6233 in)
Piston pin outer diameter 15.805-15.810 mm (0.6222-0.6224 in)
Cylinder Head
Valve Arrangement: L-head (sidevalve)
Valves: 2
Valve minimum lift – Zero lash: INTAKE 6.9 mm (0.274 in)
EXHAUST 6.9 mm (0.274 in)
Stem outer diameter (standard): INTAKE 7.8506 mm (0.3091 in)
EXHAUST 7.8126 mm (0.3076 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt 20-37 Nm; 2.04-3.77 kg·m; 14.8-27.3 ft·lb
Spark plug 18 N·m; 1.8 kg·m; 13.3 ft·lb

Service Information

Max speed 3,600 rpm
Valve clearance
Intake valve clearance 0.076-0.152 mm (0.003-0.006 in)
Exhaust valve clearance 0.278-0.354 mm (0.0109-0.0139 in)
Oil system
Oil type API SF or SG
Recommended oil Summer: SAE 30W
Winter: SAE 5W-20, 5W-30
Oil capacity (with filter) 1.6 L (1.69 US. qt, 1.41 Imp. qt.)
Ignition system
Spark plug Champion: RV17YC
Spark plug gap 0.89 mm (0.035 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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