The Kohler M12 is a 476.4 cc (29.07 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Magnum-series, manufactured by Kohler Co.
The Kohler M12 engine has an L-head (side valve) design and a horizontal PTO shaft. This engine is equipped with the Kohler-build side-draft carburetor with an adjustable jet and an electronic magneto ignition system. The M12 engine used a high-density paper air cleaner.
The cylinder bore is 85.85 mm (3.38 in) and the piston stroke is 82.6 mm (3.25 in). The compression ratio rating is 6.6:1.
The Kohler M12 engine produced 12.1 PS (8.9 KW; 12.0 HP) at 3,600 rpm of horsepower.
The breakdown of the engine code is as follows:
- M – M-series
- 12 – 12.0 HP horsepower
- 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 | |
| Model | M12 |
| Type | 4-stroke, L-head, single cylinder |
| Displacement | 476.4 cm 3 (29.07 cu-in) |
| Max. horsepower | 12.1 PS (8.9 KW; 12.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | – |
| Fuel system | Side-draft carburetor |
| Cooling system | Forced-air |
| Ignition system | Electronic magneto ignition system |
| Lubricating system | Splash type |
| Starting system | Recoil or electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 5.7 liters (1.5 US gal, 1.3 Imp. gal) |
| Weight | 58.5 kg (129 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 6.6:1 | |
| Bore x Stroke | 85.8 X 82.6 mm (3.38 x 3.25 in) | |
| Sleeve internal diameter | 85.7123-85.7377 mm (3.3745-3.3755 in) | |
| Piston skirt outer diameter | 85.4710-85.5472 mm (3.3650-3.3680 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring end gap | Top | 0.254-0.508 mm (0.010-0.020 in) |
| Second | 0.254-0.508 mm (0.010-0.020 in) | |
| Connecting rod small end ID | 22.2428-2.2505 mm (0.8757-0.8760 in) | |
| Piston pin outer diameter | 22.2377-22.2351 mm (0.8752-0.8754 in) | |
| Cylinder Head | ||
| Valve Arrangement: | L-head (sidevalve) | |
| Valves: | 2 | |
| Valve minimum lift – Zero lash: | INTAKE | 8.07 mm (0.318 in) |
| EXHAUST | 8.07 mm (0.318 in) | |
| Stem outer diameter (standard): | INTAKE | 7.887-7.899 mm (0.3105-0.3110 in) |
| EXHAUST | 7.833-7.851 mm (0.3084-0.3091 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head bolt | 34-41 Nm; 3.5-4.2 kg·m; 25-30 ft·lb |
| Spark plug | 25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb |
Service Information
| Engine | |
| Max speed | 3,600 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 | |
| Oil type | API SF or SG |
| Recommended oil | Summer: SAE 30W Winter: SAE 5W-20, 5W-30 |
| Oil capacity | 1.9 L (2.0 US. qt, 1.67 Imp. qt.) |
| Ignition system | |
| Spark plug | Champion: RH10 |
| Spark plug gap | 0.65 mm (0.0256 in) |
| Ignition module air gap | 0.30-0.40 mm (0.012-0.016 in) |
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