The Kohler CH255 is a 177 cc (10.8 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.
The Kohler CH255 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, splash type lubrication system. This engine is equipped with a fixed main jet carburetor and dependable electronic magneto ignition system. Fuel tank capacity is 3.0 liters (3.1 US.qts, 2.6 Imp. qts).
A 68.0 mm (2.70 in) cylinder bore and 49.0 mm (1.90 in) piston stroke give the CH255 engine a total of 177 cc of displacement. The compression ratio rating is 8.5:1.
This engine produces 5.5 PS (4.0 KW; 5.5 HP) at 3,600 rpm of maximum horsepower and 8.3 Nm (0.85 kg·m; 6.13 ft·lb) at 2,800 rpm of peak torque.
The breakdown of the engine code is as follows:
- C – Command series
- H – Horizontal PTO shaft
- 255 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO CH255 |
| Type | 4-stroke, OHV, single-cylinder |
| Displacement | 177 cm 3 (10.8 cu-in) |
| Max. horsepower | 5.5 PS (4.0 KW; 5.5 HP) at 3,600 rpm |
| Max. torque | 8.3 Nm (0.85 kg·m; 6.13 ft·lb) at 2,800 rpm |
| Fuel system | Carburetor with a fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Dependable electronic magneto |
| Lubricating system | Splash type |
| Starting system | Recoil starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 296 x 354 x 318 mm (11.6 x 13.9 x 12.5 in) |
| Dry weight | 15.0 kg (33.2 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.5:1 | |
| Bore x Stroke | 68.0 mm X 49.0 mm (2.70 x 1.90 in) | |
| Sleeve internal diameter | 68.027-68.035 mm (2.6280-2.6785 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 67.975-67.985 mm (2.6762-2.6766 in) | |
| Piston pin outer diameter | 17.992-17.995 mm (0.7083-0.7084 in) | |
| Ring-to-groove side clearance: | Top | 0.040-0.150 mm (0.0020-0.0060 in) |
| Second | 0.040-0.150 mm (0.0020-0.0060 in) | |
| Oil | 0.050-0.190 mm (0.0019-0.0075 in) | |
| Ring end gap: | Top | 0.325-0.400 mm (0.0130-0.0160 in) |
| Second | 0.325-0.400 mm (0.0130-0.0160 in) | |
| Crankshaft main journal diameter: | 24.975-24.989 mm (0.9833-0.9838 in) | |
| Crankpin journal diameter: | 24.975-24.989 mm (0.9833-0.9838 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Valve head diameter: | INTAKE | 24.875-25.125 mm (0.9793-0.9892 in) |
| EXHAUST | 23.800-24.200 mm (0.9370-0.9527 in) | |
| Stem outer diameter: | INTAKE | 5.474 mm (0.2155 in) |
| EXHAUST | 5.464 mm (0.2151 in) | |
| Cam lobe profile: | INTAKE | 27.608 mm (1.0870 in) |
| EXHAUST | 27.770 mm (1.0930 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head (torque in 2 increments) |
Step 1: 12.0 Nm (1.2 kgf·m; 8.9 lb·ft) Step 2: 24.0 Nm (2.4 kgf·m; 17.7 lb·ft) |
| Connecting rod | 12.5 Nm (1.3 kgf·m; 9.2 lb·ft) |
| Flywheel | 74.0 Nm (7.5 kgf·m; 54.6 lb·ft) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 ft·lb) |
Service Information
| Valve clearance | |
| Intake | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Exhaust | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Oil type | API SJ or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 liters (0.63 US.qts, 0.53 Imp. qts) |
| Ignition system | |
| Spark plug | Kohler 1413214-S |
| Spark plug gap | 0.76 mm (0.0300 in) |
| Ignition module air gap | 0.254 mm (0.010 in) |
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