The Kohler M8 is a 305 cc (18.64 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Magnum-series, manufactured by Kohler Co.
The Kohler M8 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 M8 engine used a high-density paper air cleaner.
The cylinder bore is 74.7 mm (2.94 in) and the piston stroke is 69.85 mm (2.75 in). The compression ratio rating is 6.8:1.
The Kohler M8 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:
- M – M-series
- 8 – 8.0 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 | Magnum M8 |
| Type | 4-stroke, L-head, single cylinder |
| Displacement | 305 cm 3 (18.64 cu-in) |
| Max. horsepower | 8.2 PS (6.0 KW; 8.0 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 | 4.7 liters (1.25 US gal, 1.0 Imp. gal) |
| Weight | 32.2 kg (71.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 6.8:1 | |
| Bore x Stroke | 74.7 X 69.85 mm (2.94 x 2.75 in) | |
| Sleeve internal diameter | 74.5998-74.6252 mm (2.9370-2.9370 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Style A | ||
| Piston skirt outer diameter | 74.3737-74.4144 mm (2.9281-2.9297 in) | |
| Ring end gap | Top | 0.178-0.432 mm (0.007-0.017 in) |
| Second | 0.178-0.432 mm (0.007-0.017 in) | |
| Style C and D | ||
| Piston skirt outer diameter | 74.4957-74.5134 mm (2.9329-2.9336 in) | |
| Ring end gap | Top | 0.254-0.584 mm (0.010-0.023 in) |
| Second | 0.254-0.584 mm (0.010-0.023 in) | |
| Connecting rod small end ID | 15.8877-15.8953 mm (0.6255-0.6258 in) | |
| Piston pin outer diameter | 15.8674-15.8725 mm (0.6247-0.6249 in) | |
| Cylinder Head | ||
| Valve Arrangement: | L-head (sidevalve) | |
| Valves: | 2 | |
| Valve minimum lift – Zero lash: | INTAKE | 6.90 mm (0.2718 in) |
| EXHAUST | 6.30 mm (0.2482 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 | 0.15-0.20 mm (0.0060-0.0079 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 | 0.95 liters (1 US.qts, 0.84 Imp. qts) |
| Ignition system | |
| Spark plug | Champion: RCJ-8 |
| 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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