The Kohler CH742 is a 747 cc, (45.6 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.
The Kohler CH742 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, pressurized lubrication system. This engine is equipped with a two-barrel side-draft carburetor with fixed main jets and electronic ignition system.
The cylinder bore and the piston stroke are 83.0 mm (3.27 in) and 69.0 mm (2.72 in), respectively. Compression ratio rating is 9.1:1.
The Kohler CH742 engine produced 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm of horsepower and 55.9 Nm (5.7 kg·m; 41.2 ft·lb) at 2,600 rpm of torque.
The breakdown of the engine code is as follows:
- C – Command series
- H – Horizontal PTO shaft
- 742 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO CH742 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 747 cm 3 (45.6 cu-in) |
| Max. horsepower | 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm |
| Max. torque | 55.9 Nm (5.7 kg·m; 41.2 ft·lb) at 2,600 rpm |
| Fuel system | Two-barrel side-draft carburetor (Walbro) |
| Cooling system | Forced-air |
| Ignition system | Electronic ignition system |
| Lubricating system | Pressurized lubrication |
| Starting system | Electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 371 x 451 x 622 mm (14.6 x 17.7 x 24.5 in) |
| Dry weight | 48.0 kg (105.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 9.1:1 | |
| Bore x Stroke | 83.0 mm X 69.0 mm (3.27 x 2.72 in) | |
| Sleeve internal diameter | 82.988-83.013 mm (3.2672-3.2682 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 82.978 mm (3.2668 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Ring-to-groove side clearance: | Top | 0.030-0.070 mm (0.0010-0.0026 in) |
| Second | 0.030-0.070 mm (0.0010-0.0026 in) | |
| Oil | 0.060-0.190 mm (0.0022-0.0073 in) | |
| Ring end gap: | Top | 0.189-0.277 mm (0.0074-0.0109 in) |
| Second | 1.519-1.797 mm (0.0598-0.0708 in) | |
| Crankshaft main journal diameter: | 40.913-40.935 mm (1.6107-1.6116 in) | |
| Crankpin journal diameter: | 35.955-35.973 mm (1.4155-1.4163 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter: | INTAKE | 33.370-33.630 mm (1.3138-1.324 in) |
| EXHAUST | 29.370-29.630 mm (1.1563-1.1665 in) | |
| Stem outer diameter: | INTAKE | 6.982-7.000 mm (0.2749-0.2756 in) |
| EXHAUST | 6.970-6.988 mm (0.2744-0.2751 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head |
Nut (torque in 2 increments): Step 1: 16.9 Nm (1.72 kg·m; 12.5 ft·lb) Step 2: 35.5 Nm (3.62 kg·m; 26.2 ft·lb) Bolt (torque in 2 increments) Step 1: 22.6 Nm (2.31 kg·m; 16.7 ft·lb) Step 2: 41.8 Nm (4.26 kg·m; 30.8 ft·lb) |
| Flywheel | 66.4 Nm (6.77 kg·m; 49 ft·lb) |
| Spark plug | 27 Nm (2.75 kg·m; 20.0 ft·lb) |
Service Information
| Oil system | |
| Oil type | API SG, SH, SJ, or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity |
W/o oil filter: 1.7 L (1.8 US. qt, 1.5 Imp. qt.) With oil filter: 1.9 L (2.0 US.qts, 1.7 Imp. qts) |
| Ignition system | |
| Spark plug | Champion RC12YC |
| Spark plug gap | 0.76 mm (0.030 in) |
| Ignition module air gap | 0.280-0.330 mm (0.011-0.013 in) |
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