Kohler Command PRO CS6

Kohler Command PRO CS6The Kohler Command PRO CS6 is a 171 cc (10.44 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 CS6 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 CS6 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 66.0 mm (2.6 in) and 50.0 mm (1.97 in), respectively. Compression ratio rating is 8.5:1. The Command PRO CS6 engine produced 6.1 PS (4.47 kW; 6.0 HP) at 3,600 rpm of horsepower and 10.8 N·m (1.1 kg·m, 8 ft·lb) at 2,000 rpm of torque.

The breakdown of the engine code is as follows:

  • C – Command series
  • S – Slanted cylinder
  • 6 – output power 6.0 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
ModelKohler Command PRO CS6
Type4-stroke, OHV, single cylinder
Displacement171 cm 3 (10.44 cu-in)
Max. horsepower6.1 PS (4.47 kW; 6.0 HP) at 3,600 rpm
Max. torque (crank PTO)10.8 N·m (1.1 kg·m, 8 ft·lb) at 2,000 rpm
Fuel systemCarburetor wit fixed jet (Mikuni)
Cooling systemForced-air
Ignition systemTCI (Transistor Controlled Ignition)
Lubricating systemSplash type
Starting systemRecoil or electric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity3.9 L (1.03 US. gal. 0.86 Imp. gal.)

Cylinder Block and Head

The Kohler Command PRO CS6 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 66.0 mm (2.6 in) cylinder bore and 50.0 mm (1.97 in) piston stroke give the Command PRO CS6 engine a total of 171 cc (10.44 cu·in) of displacement. Compression ratio rating is 8.5:1.

Cylinder block
Compression ratio:8.5:1
Bore x Stroke66 X 50 mm (2.6 x 1.97 in)
Sleeve internal diameter66.005-66.015 mm (2.5986-2.599 in)
Piston skirt outer diameter65.975-65.990 mm (2.5974-2.598 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.040-0.080 mm (0.0016-0.0031 in)
Second0.020-0.060 mm (0.0008-0.0024 in)
Ring end gapTop0.200-0.400 mm (0.0079-0.0157 in)
Second0.200-0.400 mm (0.0079-0.0157 in)
Oil (side rail)0.200-0.400 mm (0.0079-0.0157 in)
Connecting rod small end ID16.006-16.020 mm (0.6302-0.6307 in)
Connecting rod big end ID28.000-28.015 mm (1.1024-1.103 in)
Piston pin outer diameter16.002-16.013 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:INTAKE21.000 mm (0.8268 in)
EXHAUST19.000 mm (0.748 in)
Stem outer diameter (standard):INTAKE5.500 mm (0.2165 in)
EXHAUST5.500 mm (0.2165 in)
Valve length (standard):INTAKE64.500 mm (2.5394 in)
EXHAUST64.500 mm (2.5394 in)
Camshaft journal diameter:14.950 mm (0.5886 in)
Cam height:INTAKE26.850-26.950 mm (1.0571-1.061 in)
EXHAUST26.630-26.730 mm (1.0484-1.0524 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt20 Nm; 2.0 kg·m; 14 ft·lb
Flywheel65 Nm; 6.5 kg·m; 48 ft·lb
Oil drain plug17 Nm; 1.73 kg·m; 12.5 ft·lb
Spark plug20 N·m (2 kg·m, 14.7 ft·lb)

Service Information

Engine
Idle speed2,000 ± 150 rpm
Cylinder compression4.0-6.0 kg/cm2 (400-600 kPa, 57-85 psi) at 600 rpm
Valve clearance
Intake valve clearance0.10 mm (0.0039 in)
Exhaust valve clearance0.10 mm (0.0039 in)
Oil system
Oil typeAPI SG, SH, SJ or higher
Recommended oilSAE 10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plugNGK: BPR4ES, Champion: RN14YC, RC14YC
Spark plug gap0.8 mm (0.0315 in)
Ignition module air gap0.4-0.6 mm (0.015-0.023 in)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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