Kohler CH16

Kohler CH16The Kohler CH16/CH16S is a 426 cc (26.0 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 90.0 mm (3.60 in) and 67.0 mm (2.64 in), respectively. Compression ratio rating is 8.5:1.

The Kohler CH16 engine produced 16.2 PS (11.9 KW; 16.0 HP) at 3,600 rpm of horsepower and 33.9 Nm (3.5 kg·m; 25.0 ft·lb) at 2,400 rpm of torque.

The Kohler CH16 features:

  • OHV design
  • Hydraulic valve lifters
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Dependable electronic magneto ignition system
  • Carburetor with fixed main jet (Nikki or Keihin)
  • Mechanical centrifugal governor
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model Command PRO CH16/CH16S
Engine type 4-stroke, OHV, single-cylinder
Displacement 426 cm 3 (26.0 cu-in)
Max. horsepower 16.2 PS (11.9 KW; 16.0 HP) at 3,600 rpm
Max. torque 33.9 Nm (3.5 kg·m; 25.0 ft·lb) at 2,400 rpm
Cooling system Forced air
Air cleaner Replaceable, paper element
Lubricating system Full pressure
Ignition system Dependable electronic magneto
Fuel system Carburetor with fixed main jet (Nikki or Keihin)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Electric starter
Governor Mechanical centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 340 x 502 x 449 mm (13.41 x 19.8 x 17.7 in)
Dry weight 39.5 kg (87.1 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Cylinder bore: 90.0 mm (3.60 in)
Piston stroke: 67.0 mm (2.64 in)
Cylinder internal diameter (standard): 90.000-90.025 mm (3.5433-3.5443 in)
Number of piston rings (compression / oil): 2/1
Piston pin diameter: 18.995-19.000 mm (0.7478-0.748 in)
Thrust face outer diameter (standard): 89.951-89.969 mm (3.5413-3.5420 in)
Ring-to-groove side clearance (Top): 0.060-0.105 mm (0.0023-0.0041 in)
Ring-to-groove side clearance (Second): 0.040-0.085 mm (0.0015-0.0033 in)
Ring-to-groove side clearance (Oil): 0.176-0.260 mm (0.0067-0.0100 in)
Ring end gap (Top): 0.270-0.510 mm (0.0105-0.0200 in)
Ring end gap (Second): 0.270-0.510 mm (0.0105-0.0200 in)
Number of main bearings: 2
Crankshaft main journal diameter: Flywheel end: 44.913-44.935 mm (1.7682-1.7691 in)
Oil pan end: 41.915-41.935 mm (1.6502-1.6510 in)
Crankpin journal diameter: 38.958-30.970 mm (1.5338-1.2193 in)
Balance shaft bearing surface OD: 19.962-19.975 mm (0.7859-0.7864 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves: 2
Valve head diameter (INTAKE): 35.370-35.630 mm (1.3925-1.4028 in)
Valve head diameter (EXHAUST): 31.370-31.630 mm (1.235-1.2453 in)
Valve seat angle (INTAKE): 89°
Valve seat angle (EXHAUST): 89°
Valve seat angle (INTAKE): 45°
Valve seat angle (EXHAUST): 45°
Valve steam diameter (INTAKE): 6.982-7.000 mm (0.2749-0.2756 in)
Valve steam diameter (EXHAUST): 6.970-6.988 mm (0.2744-0.2751 in)
Valve lift minimal (INTAKE): 8.96 mm (0.353 in)
Valve lift minimal (EXHAUST): 9.14 mm (0.360 in)
Camshaft journal diameter : 19.962-19.975 mm (0.7859-0.7864 in)

Tightening torque specs

Tightening torque specs
Connecting rod 8 mm straight shank: 22.7 Nm (2.32 kg·m; 16.75 ft·lb)
8 mm step-down: 14.7 Nm (1.5 kg·m; 10.85 ft·lb)
6 mm straight shank: 11.3 Nm (1.15 kg·m; 8.34 ft·lb)
Cylinder head (torque in 2 increments) Step 1: 20.0 Nm (2.0 kg·m; 15.0 ft·lb)
Step 2: 40.0 Nm (4.0 kg·m; 30.0 ft·lb)
Fan 9.9 Nm (1.0 kg·m; 7.3 ft·lb)
Flywheel 66.4 Nm (6.77 kg·m; 49.0 ft·lb)
Muffler retaining nuts 24.4 Nm (2.5 kg·m; 18.0 ft·lb)
Spark plug 38.0-43.4 Nm (3.9-4.4 kgf·m; 28.0-32.0 lb·ft)
Oil drain plug 7.3-9.0 Nm (0.7-0.9 kgf·m; 5.4-6.6 lb·ft)

Service Data

Maximum speed: 3600±50 rpm
Idle speed: 1200±75 rpm
Compression pressure
Standard: 1.1 MPa (160 psi)
Compression differential limit between cylinders: 15% and less
Oil system
Lubrication system: Full pressure
Oil type: API SG, SH, SJ, or higher
Recommended oil: SAE 10W-30
Oil capacity: W/o oil filter: 1.7 L (1.8 US. qt, 1.5 Imp. qt.)
With oil filter: 1.9 L (2.0 US.qts, 1.7 Imp. qts)
Fuel system
Type: Carburetor with fixed main jet (Nikki or Keihin)
Fuel pump: Pulse type
Fuel filter: In-line
Ignition system
Type: Dependable electronic magneto
Spark plug: Champion RC12YC or Platinum 3071
Spark plug gap: 1.02 mm (0.040 in)
Ignition coil air gap 0.200-0.300 mm (0.0079-0.0118 in)


1. Kohler Command CH11-16 horizontal crankshaft service manual. Kohler Co. 1990.

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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