Kohler CV450

Kohler CV450The Kohler CV450 is a 426 cc (26.0 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.

The Kohler CV450 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, vertical PTO-shaft, full-pressurized lubrication system. This engine is equipped with a carburetor (Nikki or Keihin) with a fixed main jet and dependable electronic magneto ignition system.

A 90.0 mm (3.60 in) cylinder bore and 67.0 mm (2.64 in) piston stroke give the CV450 engine a total of 426 cc of displacement. The compression ratio rating is 8.5:1.

This engine produced 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm of horsepower and 33.2 Nm (3.4 kg·m; 24.5 ft·lb) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • C – Command series
  • V – Vertical PTO shaft
  • 450 – Numerical designation

General information

Engine Specifications
ModelCommand PRO CV450
Type4-stroke, OHV, single-cylinder
Displacement426 cm 3 (26.0 cu-in)
Max. horsepower15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm
Max. torque33.2 Nm (3.4 kg·m; 24.5 ft·lb) at 2,400 rpm
Fuel systemCarburetor with a fixed main jet (Nikki or Keihin)
Cooling systemForced-air
Ignition systemDependable electronic magneto
Lubricating systemPressurized lubrication
Starting systemElectric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Dimensions (L x W X H)450 x 365 x 321 mm (17.7 x 14.4 x 12.6 in)
Dry weight39.5 kg (87.1 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.5:1
Bore x Stroke90.0 mm X 67.0 mm (3.60 x 2.64 in)
Sleeve internal diameter90.000-90.025 mm (3.5433-3.5443 in)
Number of piston rings (compression / oil):2 / 1
Thrust face outer diameter89.951-89.969 mm (3.5413-3.5420 in)
Piston pin outer diameter18.995-19.000 mm (0.7478-0.748 in)
Ring-to-groove side clearance:Top0.060-0.105 mm (0.0023-0.0041 in)
Second0.040-0.085 mm (0.0015-0.0033 in)
Oil0.036-0.186 mm (0.0014-0.0073 in)
Ring end gap:Top0.280-0.510 mm (0.0110-0.0200 in)
Second0.220-0.480 mm (0.0080-0.0180 in)
Oil0.250-0.760 mm (0.0098-0.0299 in)
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)
Cylinder Head
Valve Arrangement:OHV, gear drive
Valves:4 (2 per cylinder)
Valve head diameter:INTAKE35.370-35.630 mm (1.3925-1.4028 in)
EXHAUST31.370-31.630 mm (1.235-1.2453 in)
Stem outer diameter:INTAKE6.982-7.000 mm (0.2749-0.2756 in)
EXHAUST6.970-6.988 mm (0.2744-0.2751 in)

Tightening torque specs

Tightening torque specs
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)
Flywheel66.4 Nm (6.77 kg·m; 49 ft·lb)
Spark plug27 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Oil system
Oil typeAPI SG, SH, SJ, or higher
Recommended oilSAE 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)
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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