The Kohler Command PRO CS4 is a 123 cc (7.5 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from Command PRO series, manufactured by Kohler Co., for general-purpose applications, such as construction and industrial equipment, portable generators, commercial or residential lawn and garden equipment.
The Kohler CS4 engine has an OHV (overhead valve) design, cast iron cylinder liners, aluminum block, steel-forged horizontal shaft, and dual main ball bearings. This engine is equipped with fixed jet Mikuni carburetor, electronic TCI (Transistor Controlled Ignition) system, mechanical governor and automatic compression release. The CS4 engine can be equipped with one of three air cleaner configurations: the standard dual-element air cleaner, heavy-duty cyclonic air cleaner (option), or an oiled, solid foam element (option).
Cylinder bore and piston stroke are 56.0 mm (2.2 in) and 50.0 mm (1.97 in), respectively. Compression ratio rating is 8.3:1. The Command PRO CS4 engine produced 4.0 PS (2.9 kW; 4.0 HP) at 3,600 rpm of maximum horsepower and 7.6 N·m (0.8 kg·m, 5.6 ft·lb) at 2,000 rpm of peak torque.
The breakdown of the engine code is as follows:
- C – Command series
- S – Slanted cylinder
- 4 – output power 4.0 HP
- Suffix (engine is available with the following options):
S – Electric starter;
T – Retractable starter;
G – Tapered crankshaft;
P – Threaded crankshaft;
R – Gear Reduction (2:1 or 6:1);
General information
| Engine Specifications | |
| Model | Kohler Command PRO CS4 |
| Type | 4-stroke, OHV, single cylinder |
| Displacement | 123 cm 3 (7.5 cu-in) |
| Max. horsepower | 4.0 PS (2.9 kW; 4.0 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 7.6 N·m (0.8 kg·m, 5.6 ft·lb) at 2,000 rpm |
| Fuel system | Carburetor wit fixed jet (Mikuni) |
| Cooling system | Forced-air |
| Ignition system | TCI (Transistor Controlled Ignition) |
| Lubricating system | Splash type |
| Starting system | Recoil or electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 3.9 L (1.03 US. gal. 0.86 Imp. gal.) |
Cylinder Block and Head
The Kohler Command PRO CS4 has aluminum cylinder block with cast iron cylinder liner, dual ball bearing supported forged steel crankshaft. The piston has two compression rings and one oil ring. A 56.0 mm (2.2 in) cylinder bore and 50.0 mm (1.97 in) piston stroke give the Command PRO CS4 engine a total of 123 cc (7.5 cu·in) of displacement. Compression ratio rating is 8.3:1.
| Cylinder block | ||
| Compression ratio: | 8.3:1 | |
| Bore x Stroke | 56 X 50 mm (2.2 x 1.97 in) | |
| Sleeve internal diameter | 56.005-56.015 mm (2.2049-2.2053 in) | |
| Piston skirt outer diameter | 55.975-55.990 mm (2.2037-2.2043 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.040-0.080 mm (0.0016-0.0031 in) |
| Second | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Ring end gap | Top | 0.200-0.400 mm (0.0079-0.0157 in) |
| Second | 0.200-0.400 mm (0.0079-0.0157 in) | |
| Oil (side rail) | 0.200-0.400 mm (0.0079-0.0157 in) | |
| Connecting rod small end ID | 16.006-16.020 mm (0.6302-0.6307 in) | |
| Connecting rod big end ID | 28.000-28.015 mm (1.1024-1.103 in) | |
| Piston pin outer diameter | 16.002-16.013 mm (0.63-0.6304 in) | |
| Crankshaft main journal diameter: | 52.000 mm (2.0472 in) | |
| Crankpin diameter: | 27.969-27.984 mm (1.1011-1.1017 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Valve head diameter: | INTAKE | 21.000 mm (0.8268 in) |
| EXHAUST | 19.000 mm (0.748 in) | |
| Stem outer diameter (standard): | INTAKE | 5.500 mm (0.2165 in) |
| EXHAUST | 5.500 mm (0.2165 in) | |
| Valve length (standard): | INTAKE | 64.500 mm (2.5394 in) |
| EXHAUST | 64.500 mm (2.5394 in) | |
| Camshaft journal diameter: | 14.950 mm (0.5886 in) | |
| Cam height: | INTAKE | 26.850-26.950 mm (1.0571-1.061 in) |
| EXHAUST | 26.630-26.730 mm (1.0484-1.0524 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head bolt | 20 Nm; 2.0 kg·m; 14 ft·lb |
| Flywheel | 65 Nm; 6.5 kg·m; 48 ft·lb |
| Oil drain plug | 17 Nm; 1.73 kg·m; 12.5 ft·lb |
| Spark plug | 20 N·m (2 kg·m, 14.7 ft·lb) |
Service Information
| Engine | |
| Idle speed | 2,000 ± 150 rpm |
| Cylinder compression | 4.0-6.0 kg/cm2 (400-600 kPa, 57-85 psi) at 600 rpm |
| Valve clearance | |
| Intake valve clearance | 0.10 mm (0.0039 in) |
| Exhaust valve clearance | 0.10 mm (0.0039 in) |
| Oil system | |
| Oil type | API SG, SH, SJ or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 L (0.63 US. qt, 0.53 Imp. qt.) |
| Ignition system | |
| Spark plug | NGK: BPR4ES, Champion: RN14YC, RC14YC |
| Spark plug gap | 0.8 mm (0.0315 in) |
| Ignition module air gap | 0.4-0.6 mm (0.015-0.023 in) |
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