Kohler CH735

Kohler CH735The Kohler CH735 is a 725 cc, (44.2 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.

The Kohler CH735 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, pressurized lubrication system. This engine is equipped with a EFI (electronic fuel injection) system and electronic ignition system.

The cylinder bore and the piston stroke are 83.0 mm (3.27 in) and 67.0 mm (2.64 in), respectively. Compression ratio rating is 9.0:1.

The CH735 engine produced 26.4 PS (19.4 KW; 26.0 HP) at 3,600 rpm of horsepower and 54.2 Nm (5.53 kg·m; 40 ft·lb) at 2,800 rpm of torque.

The breakdown of the engine code is as follows:

  • C – Command series
  • H – Horizontal PTO shaft
  • 735 – Numerical designation

General information

Engine Specifications
ModelCommand PRO CH735
Type4-stroke, OHV, V-twin
Displacement725 cm 3 (44.2 cu-in)
Max. horsepower26.4 PS (19.4 KW; 26.0 HP) at 3,600 rpm
Max. torque54.2 Nm (5.53 kg·m; 40 ft·lb) at 2,800 rpm
Fuel systemEFI (electronic fuel injection) system
Cooling systemForced-air
Ignition systemElectronic ignition system
Lubricating systemPressurized lubrication
Starting systemElectric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Dimensions (L x W X H)355 x 451 x 483 mm (14.0 x 17.7 x 19.0 in)
Dry weight43.0 kg (94.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:9.0:1
Bore x Stroke83.0 mm X 67.0 mm (3.27 x 2.64 in)
Sleeve internal diameter82.988-83.013 mm (3.2672-3.2682 in)
Number of piston rings (compression / oil):2 / 1
Piston style A
Thrust face outer diameter82.949-82.967 mm (3.2656-3.2664 in)
Piston pin outer diameter16.995-17.000 mm (0.6691-0.6693 in)
Ring-to-groove side clearance:Top0.025-0.048 mm (0.001-0.0019 in)
Second0.015-0.037 mm (0.0006-0.0015 in)
Oil0.026-0.176 mm (0.001-0.0069 in)
Ring end gap:Top0.250-0.560 mm (0.0098-0.022 in)
Second0.250-0.560 mm (0.0098-0.022 in)
Piston style B
Thrust face outer diameter82.978 mm (3.2668 in)
Piston pin outer diameter16.995-17.000 mm (0.6691-0.6693 in)
Ring-to-groove side clearance:Top0.030-0.070 mm (0.001-0.0026 in)
Second0.030-0.070 mm (0.001-0.0026 in)
Oil0.060-0.190 mm (0.0022-0.0073 in)
Ring end gap:Top0.189-0.277 mm (0.0074-0.0109 in)
Second1.519-1.797 mm (0.0598-0.0708 in)
Crankshaft main journal diameter:40.913-40.935 mm (1.6107-1.6116 in)
Crankpin journal diameter:35.955-35.973 mm (1.4155-1.4163 in)
Cylinder Head
Valve Arrangement:OHV, gear drive
Valves:4 (2 per cylinder)
Valve head diameter:INTAKE33.370-33.630 mm (1.3138-1.324 in)
EXHAUST29.370-29.630 mm (1.1563-1.1665 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 Nut (torque in 2 increments):
Step 1: 16.9 Nm (1.72 kg·m; 12.5 ft·lb)
Step 2: 35.5 Nm (3.62 kg·m; 26.2 ft·lb)
Bolt (torque in 2 increments)
Step 1: 22.6 Nm (2.31 kg·m; 16.7 ft·lb)
Step 2: 41.8 Nm (4.26 kg·m; 30.8 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 gap0.76 mm (0.030 in)
Ignition module air gap0.280-0.330 mm (0.011-0.013 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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