Kohler CH6

Kohler CH6The Kohler CH6/CH6S is a 180 cc (10.98 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.

The Kohler CH6S 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 Keihin carburetor with a fixed main jet or Walbro carburetor with an adjustable main jet, dependable electronic magneto ignition system and electric starter.

A 67.0 mm (2.64 in) cylinder bore and 51.0 mm (2.01 in) piston stroke give the CH6 engine a total of 180 cc of displacement. The compression ratio rating is 8.5:1.

This 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 breakdown of the engine code is as follows:

  • C – Command series
  • H – Horizontal PTO shaft
  • 6 – Numerical designation
  • Version code:
    • S – Electric start
    • T – Retractable start
    • ST – Electric/Retractable start

General information

Engine Specifications
Model Command PRO CH6S
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
Fuel system Carburetor with a fixed main jet (Keihin)
Carburetor with a adjustable main jet (Walbro)
Fuel tank capacity 2.84 liters (3.0 US.qts, 2.5 Imp. qts)
Cooling system Forced-air
Ignition system Dependable electronic magneto
Lubricating system Splash type
Starting system Electric starter
Fuel used Unleaded gasoline (octane number 86 or higher)
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
Bore x Stroke 67.0 mm X 51.0 mm (2.64 x 2.01 in)
Sleeve internal diameter 67.000-67.030 mm (2.6378-2.6390 in)
Number of piston rings (compression / oil): 2 / 1
Piston pin outer 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)
Second 0.040-0.072 mm (0.0016-0.0028 in)
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)
Second 0.250-0.450 mm (0.0100-0.0180 in)
Cylinder Head
Valve Arrangement: OHV
Valves: 2
Valve head diameter: INTAKE 26.500-26.750 mm (1.0433-1.0531 in)
EXHAUST 24.500-24.750 mm (0.9645-0.9744 in)
Stem outer diameter: INTAKE 4.934-4.952 mm (0.1942-0.1949 in)
EXHAUST 4.911-4.929 mm (0.1933-0.1944 in)

Tightening torque specs

Tightening torque specs
Cylinder head (torque in 2 increments) 22.6 Nm (2.3 kgf·m; 16.7 lb·ft)
Connecting rod cap 9.0 Nm (0.9 kgf·m; 6.6 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 Information

Oil system
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
Spark plug Champion RC12YC
Spark plug gap 1.00 mm (0.0394 in)
Ignition module air gap 0.200-0.300 mm (0.0079-0.0118 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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