Kohler CH5

Kohler CH5The Kohler CH5/CH5S 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 CH5S 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 carburetor (Walbro) with a fixed 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 CH5 engine a total of 180 cc of displacement. The compression ratio rating is 8.5:1.

This 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 breakdown of the engine code is as follows:

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

General information

Engine Specifications
ModelCommand PRO CH5S
Type4-stroke, OHV, single-cylinder
Displacement180 cm 3 (10.98 cu-in)
Max. horsepower5.1 PS (3.73 KW; 5.0 HP) at 3,600 rpm
Max. torque11.4 Nm (1.2 kg·m; 8.4 ft·lb) at 2,200 rpm
Fuel systemCarburetor with a fixed main jet (Walbro)
Fuel tank capacity3.78 liters (4.0 US.qts, 3.33 Imp. qts)
Cooling systemForced-air
Ignition systemDependable electronic magneto
Lubricating systemSplash type
Starting systemElectric starter
Fuel usedUnleaded 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 weight20.4 kg (45.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.5:1
Bore x Stroke67.0 mm X 51.0 mm (2.64 x 2.01 in)
Sleeve internal diameter67.000-67.030 mm (2.6378-2.6390 in)
Number of piston rings (compression / oil):2 / 1
Piston pin outer diameter13.996-14.000 mm (0.5510-0.5512 in)
Ring-to-groove side clearance:Top0.040-0.085 mm (0.0016-0.0033 in)
Second0.040-0.072 mm (0.0016-0.0028 in)
Oil0.140-0.275 mm (0.0055-0.0108 in)
Ring end gap:Top0.250-0.450 mm (0.0100-0.0180 in)
Second0.250-0.450 mm (0.0100-0.0180 in)
Cylinder Head
Valve Arrangement:OHV
Valve head diameter:INTAKE26.500-26.750 mm (1.0433-1.0531 in)
EXHAUST24.500-24.750 mm (0.9645-0.9744 in)
Stem outer diameter:INTAKE4.934-4.952 mm (0.1942-0.1949 in)
EXHAUST4.911-4.929 mm (0.1933-0.1944 in)

Tightening torque specs

Tightening torque specs
Cylinder head22.6 Nm (2.3 kgf·m; 16.7 lb·ft)
Connecting rod cap9.0 Nm (0.9 kgf·m; 6.6 lb·ft)
Flywheel67.8 Nm (6.9 kgf·m; 50.0 lb·ft)
Spark plug24.4-29.8 Nm (2.5-3 kgf·m; 18-22 lb·ft)

Service Information

Oil system
Oil typeAPI SF or SG
Recommended oilSAE 10W-30, 10W-40
Oil capacity0.66 liters (0.7 US.qts, 0.58 Imp. qts)
Ignition system
Spark plugChampion RC12YC
Spark plug gap1.00 mm (0.0394 in)
Ignition module air gap0.200-0.300 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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