Kohler CH5

Kohler CH5The Kohler CH5/CH5S is a 180 cc (10.98 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the Command PRO series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.

The cylinder bore and the piston stroke are 67.0 mm (2.64 in) and 51.0 mm (2.01 in), respectively. Compression ratio rating is 8.5:1.

The Kohler CH5 engine produced 5.1 PS (3.73 KW; 5.0 HP) at 3,600 rpm of horsepower and 11.4 Nm (1.2 kg·m; 8.4 ft·lb) at 2,200 rpm of torque.

The Kohler CH5S features:

  • OHV design
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Dependable electronic magneto ignition system
  • Carburetor with fixed main jet (Walbro)
  • Mechanical centrifugal governor
  • Splash type lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model Command PRO CH5S
Engine type 4-stroke, OHV, single-cylinder
Displacement 180 cm 3 (10.98 cu-in)
Max. horsepower 5.1 PS (3.73 KW; 5.0 HP) at 3,600 rpm
Max. torque 11.4 Nm (1.2 kg·m; 8.4 ft·lb) at 2,200 rpm
Cooling system Forced air
Air cleaner Replaceable, dual type
Lubricating system Splash type
Ignition system Dependable electronic magneto
Fuel system Carburetor with fixed main jet (Walbro)
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 3.78 liters (4.0 US.qts, 3.33 Imp. qts)
Starting system Electric starter
Governor Mechanical centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
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
Cylinder bore: 67.0 mm (2.64 in)
Piston stroke: 51.0 mm (2.01 in)
Cylinder internal diameter (standard): 67.000-67.030 mm (2.6378-2.6390 in)
Number of piston rings (compression / oil): 2/1
Piston pin 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)
Ring-to-groove side clearance (Second): 0.040-0.072 mm (0.0016-0.0028 in)
Ring-to-groove side clearance (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)
Ring end gap (Second): 0.250-0.450 mm (0.0100-0.0180 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves: 2
Valve head diameter (INTAKE): 26.500-26.750 mm (1.0433-1.0531 in)
Valve head diameter (EXHAUST): 24.500-24.750 mm (0.9645-0.9744 in)
Valve seat angle (INTAKE): 89°
Valve seat angle (EXHAUST): 89°
Valve face angle (INTAKE): 45°
Valve face angle (EXHAUST): 45°
Valve steam diameter (INTAKE): 4.934-4.952 mm (0.1942-0.1949 in)
Valve steam diameter (EXHAUST): 4.911-4.929 mm (0.1933-0.1944 in)
Valve lift minimal (INTAKE): 5.400 mm (0.213 in)
Valve lift minimal (EXHAUST): 5.400 mm (0.213 in)

Tightening torque specs

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

Valve-to-tappet clearance
Intake/Exhaust 0.051 mm (0.0020 in)
Oil system
Lubrication system: Splash type
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
Type: Dependable electronic magneto
Spark plug: Champion RC12YC
Spark plug gap 1.00 mm (0.0394 in)
Spark plug torque: 27 Nm (2.75 kg·m; 20.0 lb·ft)
Ignition coil air gap 0.200-0.300 mm (0.0079-0.0118 in)


1. Kohler Command 5,6 HP service manual. Kohler Co. 1989.

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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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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