The 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: | 38.958-38.970 mm (1.5338-1.5342 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
| Engine | |
| 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) |
References
1. Kohler Command CH11-16 horizontal crankshaft service manual. Kohler Co. 1990.
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