Kohler CV12.5

Kohler CV12.5The Kohler CV12.5/CV12.5S is a 398 cc (24.3 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.

The Kohler CV12.5 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 87.0 mm (3.43 in) cylinder bore and 67.0 mm (2.64 in) piston stroke give the CV12.5 engine a total of 398 cc of displacement. The compression ratio rating is 8.5:1.

This engine produced 12.7 PS (9.33 KW; 12.5 HP) at 3,600 rpm of horsepower and 27.8 Nm (2.8 kg·m; 20.5 ft·lb) at 2,500 rpm of torque.

The breakdown of the engine code is as follows:

  • C – Command series
  • V – Vertical PTO shaft
  • 12.5 – Numerical designation
  • Version code
    • S – Electric Start
    • T – Retractable Start
    • ST – Electric/Retractable Start

General information

Engine Specifications
ModelCommand PRO CV12.5 / CV12.5S
Type4-stroke, OHV, single-cylinder
Displacement398 cm 3 (24.3 cu-in)
Max. horsepower12.7 PS (9.33 KW; 12.5 HP) at 3,600 rpm
Max. torque27.8 Nm (2.8 kg·m; 20.5 ft·lb) at 2,500 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 Stroke87.0 mm X 67.0 mm (3.43 x 2.64 in)
Sleeve internal diameter87.000-87.025 mm (3.4252-3.4262 in)
Number of piston rings (compression / oil):2 / 1
Thrust face outer diameter86.941-86.959 mm (3.4229-3.4236 in)
Piston pin outer diameter18.995-19.000 mm (0.7478-0.748 in)
Ring-to-groove side clearance:Top0.034-0.100 mm (0.0013-0.0039 in)
Second0.040-0.080 mm (0.0016-0.0031 in)
Oil0.036-0.186 mm (0.0014-0.0073 in)
Ring end gap:Top0.250-0.500 mm (0.0098-0.0197 in)
Second0.250-0.510 mm (0.0098-0.0201 in)
Oil0.250-1.020 mm (0.0098-0.0402 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
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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

1 Comment

Leave a Reply

Your email address will not be published.