The Kohler CH6/CH6S is a 180 cc (10.98 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the Command PRO series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.
The cylinder bore and the piston stroke are 67.0 mm (2.64 in) and 51.0 mm (2.01 in), respectively. Compression ratio rating is 8.5:1.
The Kohler CH6 engine produced 6.1 PS (4.47 KW; 6.0 HP) at 4,000 rpm of horsepower and 11.6 Nm (1.2 kg·m; 8.6 ft·lb) at 2,600 rpm of torque.
The Kohler CH6S features:
- OHV design
- Aluminum cylinder block
- Cast iron cylinder liners
- Dependable electronic magneto ignition system
- Carburetor with fixed main jet (Keihin) or carburetor with an adjustable main jet (Walbro)
- Mechanical centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | Command PRO CH6S |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 180 cm 3 (10.98 cu-in) |
| Max. horsepower | 6.1 PS (4.47 KW; 6.0 HP) at 4,000 rpm |
| Max. torque | 11.6 Nm (1.2 kg·m; 8.6 ft·lb) at 2,600 rpm |
| Cooling system | Forced air |
| Air cleaner | Replaceable, dual type |
| Lubricating system | Splash type |
| Ignition system | Dependable electronic magneto |
| Fuel system | Carburetor with fixed main jet (Keihin) or carburetor with an adjustable main jet (Walbro) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 2.84 liters (3.0 US.qts, 2.5 Imp. qts) |
| Starting system | Electric starter |
| Governor | Mechanical centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 292 x 378 x 345 mm (11.5 x 14.9 x 13.6 in) |
| Dry weight | 20.4 kg (45.0 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.5:1 |
| Cylinder bore: | 67.0 mm (2.64 in) |
| Piston stroke: | 51.0 mm (2.01 in) |
| Cylinder internal diameter (standard): | 67.000-67.030 mm (2.6378-2.6390 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 13.996-14.000 mm (0.5510-0.5512 in) |
| Ring-to-groove side clearance (Top): | 0.040-0.085 mm (0.0016-0.0033 in) |
| Ring-to-groove side clearance (Second): | 0.040-0.072 mm (0.0016-0.0028 in) |
| Ring-to-groove side clearance (Oil): | 0.140-0.275 mm (0.0055-0.0108 in) |
| Ring end gap (Top): | 0.250-0.450 mm (0.0100-0.0180 in) |
| Ring end gap (Second): | 0.250-0.450 mm (0.0100-0.0180 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 2 |
| Valve head diameter (INTAKE): | 26.500-26.750 mm (1.0433-1.0531 in) |
| Valve head diameter (EXHAUST): | 24.500-24.750 mm (0.9645-0.9744 in) |
| Valve seat angle (INTAKE): | 89° |
| Valve seat angle (EXHAUST): | 89° |
| Valve face angle (INTAKE): | 45° |
| Valve face angle (EXHAUST): | 45° |
| Valve steam diameter (INTAKE): | 4.934-4.952 mm (0.1942-0.1949 in) |
| Valve steam diameter (EXHAUST): | 4.911-4.929 mm (0.1933-0.1944 in) |
| Valve lift minimal (INTAKE): | 5.400 mm (0.213 in) |
| Valve lift minimal (EXHAUST): | 5.400 mm (0.213 in) |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod cap | 9.0 Nm (0.9 kgf·m; 6.6 lb·ft) |
| Cylinder head | 22.6 Nm (2.3 kgf·m; 16.7 lb·ft) |
| Flywheel | 67.8 Nm (6.9 kgf·m; 50.0 lb·ft) |
| Spark plug | 24.4-29.8 Nm (2.5-3 kgf·m; 18-22 lb·ft) |
Service Data
| Valve-to-tappet clearance | |
| Intake/Exhaust | 0.051 mm (0.0020 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | API SF or SG |
| Recommended oil: | SAE 10W-30, 10W-40 |
| Oil capacity: | 0.66 liters (0.7 US.qts, 0.58 Imp. qts) |
| Ignition system | |
| Type: | Dependable electronic magneto |
| Spark plug: | Champion RC12YC |
| Spark plug gap | 1.00 mm (0.0394 in) |
| Spark plug torque: | 27.0 Nm (2.75 kg·m; 20.0 lb·ft) |
| Ignition coil air gap | 0.200-0.300 mm (0.0079-0.0118 in) |
References
1. Kohler Command 5,6 HP service manual. Kohler Co. 1989.
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