Kohler FCH749

Kohler FCH749The Kohler FCH749 is a 747 cc, (45.6 cu·in) V-twin air-cooled four-stroke internal combustion flex fuel engine from the Command PRO Flex Fuel series, manufactured by Kohler Co.

The Kohler FCH749 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 an EFI (Electronic Fuel Injection) system and electronic ignition system.

The cylinder bore and the piston stroke are 83.0 mm (3.27 in) and 69.0 mm (2.72 in), respectively. Compression ratio rating is 9.1:1.

The Kohler FCH749 engine produced 26.9 PS (19.8 KW; 26.5 HP) at 3,600 rpm of horsepower and 54.2 Nm (5.53 kg·m; 40.0 ft·lb) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • F – Flex Fuel
  • C – Command series
  • H – Horizontal PTO shaft
  • 749 – Numerical designation

General information

Engine Specifications
ModelCommand PRO Flex Fuel FCH749
Type4-stroke, OHV, V-twin
Displacement747 cm 3 (45.6 cu-in)
Max. horsepower26.9 PS (19.8 KW; 26.5 HP) at 3,600 rpm
Max. torque54.2 Nm (5.53 kg·m; 40.0 ft·lb) at 2,400 rpm
Fuel systemEFI (Electronic Fuel Injection)
Cooling systemForced-air
Ignition systemElectronic ignition system
Lubricating systemPressurized lubrication
Starting systemElectric starter
Fuel usedAll ethanol blends between E0 and E85
Dimensions (L x W X H)376 x 470 x 622 mm (14.8 x 18.5 x 24.5 in)
Dry weight49.0 kg (108.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:9.1:1
Bore x Stroke83.0 mm X 69.0 mm (3.27 x 2.72 in)
Sleeve internal diameter83.006-83.031 mm (3.2680-3.2689 in)
Number of piston rings (compression / oil):2 / 1
Piston style A
Thrust face outer diameter82.949-82.967 mm (3.2657-3.2664 in)
Piston pin outer diameter16.995-17.000 mm (0.6691-0.6693 in)
Ring-to-groove side clearance:Top0.050-0.095 mm (0.0019-0.0037 in)
Second0.030-0.075 mm (0.0012-0.00307 in)
Oil0.010-0.110 mm (0.0004-0.0043 in)
Ring end gap:Top0.250-0.560 mm (0.0004-0.0043 in)
Second0.250-0.560 mm (0.0004-0.0043 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 (0.0010-0.0026 in)
Second0.030-0.070 mm (0.0010-0.0026 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)
Flywheel71.6 Nm (7.3 kgf·m; 52.8 ft·lb)
Spark plug27 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Oil system
Oil typeAPI SJ, or higher
Recommended oilSAE 10W-30, Kohler PRO 10W-50
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 or XC12YC
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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