Kohler M14

Kohler M14The Kohler M14 is a 512 cc, (31.27 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.

The cylinder bore is 88.9 mm (3.50 in) and the piston stroke is 82.6 mm (3.25 in). The compression ratio rating is 7.0:1.

The Kohler M14 engine produced 14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm of maximum output power.

The Kohler M14 features:

  • L-head (side valve) design
  • Electronic magneto ignition system
  • Side-draft carburetor
  • Centrifugal type governor
  • Splash lubrication system
  • Forced air cooling system
  • Recoil or electric starter

The Kohler Magnum 14 suffix (engine is available with the following options):

  • S – Electric starter;
  • T – Retractable starter;
  • ST – Electric and retractable starter;
  • G – Tapered crankshaft (Generator applications);
  • P – Threaded crankshaft (Pump applications);
  • R – Reduction gear unit;
  • EP – Generator;

General information

Engine Specifications
Engine modelMagnum M14
Engine type4-stroke, L-head, single-cylinder
Displacement512 cm3, (31.27 cu·in)
Max. horsepower14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm
Max. torque
Cooling systemForced air
Air cleanerHigh-density paper
Lubricating systemSplash
Ignition systemElectronic magneto ignition system
Fuel systemSide-draft carburetor with adjustable jet
Fuel tank capacity5.7 liters (1.5 US gal, 1.3 Imp. gal)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemRecoil or electric starter
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dry weight58.5 kg (129.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:7.0:1
Cylinder bore:88.9 mm (3.50 in)
Piston stroke:82.6 mm (3.25 in)
Cylinder internal diameter (standard):88.8873-88.9127 mm (3.4995-3.5005 in)
Piston skirt outer diameter (standard):88.7095-88.7501 mm (3.4925-3.4941 in)
Number of piston rings (compression / oil):2/1
Connecting rod small end diameter (standard):22.2428-2.2505 mm (0.8757-0.8760 in)
Piston pin diameter:22.2377-22.2351 mm (0.8752-0.8754 in)
Side clearance (Top):0.152 mm (0.006 in)
Side clearance (Second):0.152 mm (0.006 in)
Ring end gap (Top):0.254-0.508 mm (0.010-0.020 in)
Ring end gap (Second):0.254-0.508 mm (0.010-0.020 in)
Crankpin journal diameter:38.0873-38.1000 mm (1.4995-1.5000 in)
Crankshaft main bearing surface outer diameter:39.9923-40.0025 mm (1.5745-1.5749 in)
Cylinder head
Valve arrangement:L-head (side valve)
Valve head diameter (INTAKE):34.798-35.052 mm (1.370-1.380 in)
Valve head diameter (EXHAUST):28.448-28.702 mm (1.120-1.130 in)
Valve seat angle (INTAKE):89°
Valve seat angle (EXHAUST):89°
Valve seat angle (INTAKE):45°
Valve seat angle (EXHAUST):45°
Valve steam min diameter (INTAKE):7.8816 mm (0.3103 in)
Valve steam min diameter (EXHAUST):7.8079 mm (0.3074 in)
Valve minimum lift, zero lash (INTAKE):8.07 mm (0.318 in)
Valve minimum lift, zero lash (EXHAUST):8.07 mm (0.318 in)

Service Data

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
Oil type:API SF or SG
Recommended oil:Summer: SAE 30 Winter: SAE 5W-20, 5W-30
Oil capacity:1.9 L (2.00 US. qt, 1.67 Imp. qt.)
Fuel system
Type:Side-draft carburetor
Preliminary main fuel screw setting:2-1/2 turns
Preliminary idle fuel screw setting:2-1/2 turns
Float level:11/64 ± 1/32
Float drop:1-1/32
Ignition system
Type:Electronic magneto 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)
Ignition coil air gap0.30-0.40 mm (0.012-0.016 in)


Manufacturer or BrandModels
Lawn tractors
Power King1214
ToroWheel Horse 314-8, Wheel Horse 314-H


1. Kohler Magnum M8, M10, M12, M14, M16 single cylinder engine service manual. Kohler Co.

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.

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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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