Kohler ECH440

Kohler ECH440The Kohler ECH440 is a 429 cc (24.7 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the Command PRO EFI series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.

The cylinder bore and the piston stroke are 89.0 mm (3.50 in) and 69.0 mm (2.70 in), respectively. Compression ratio rating is 8.0:1.

The Kohler ECH440 engine produces 14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm of maximum power and 30.8 Nm (3.14 kg·m; 22.73 ft·lb) at 2,800 rpm of maximum torque.

The Kohler ECH440 features:

  • OHV design
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Swirl-induction combustion chamber
  • Electronically controlled ignition system
  • Electronic Fuel Injection (EFI) system
  • Dual ball bearings
  • Steel-forged-andhardened crankshaft
  • Splash type lubrication system
  • Forced air cooling system
  • Recoil starter (12-volt starter available as an option)

General information

Engine Specifications
Engine modelCommand PRO EFI ECH440
Engine type4-stroke, OHV, single-cylinder
Displacement429 cm 3 (24.7 cu-in)
Max. horsepower14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm
Max. torque30.8 Nm (3.14 kg·m; 22.73 ft·lb) at 2,800 rpm
Cooling systemForced air
Air cleanerQuad-Clean heavy-duty cyclonic air cleaner
Lubricating systemSplash type lubrication
Ignition systemElectronically controlled ignition system
Fuel systemElectronic Fuel Injection (EFI) system
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity7.0 liters (7.4 US.qts, 6.16 Imp. qts)
Starting systemRecoil starter
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)324 x 452 x 467 mm (12.7 x 17.8 x 18.4 in)
Dry weight33.0 kg (72.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:8.0:1
Cylinder bore:89.0 mm (3.50 in)
Piston stroke:69.0 mm (2.70 in)
Cylinder internal diameter (standard):89.000-89.015 mm (3.5039-3.50454 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:19.992-19.998 mm (0.7871-0.7873 in)
Thrust face outer diameter (standard):88.955-88.975 mm (3.5020-3.5030 in)
Connecting rod big end diameter (standard):33.020-33.030 mm (1.3000-1.3004 in)
Ring-to-groove side clearance (Top):0.045 mm (0.0018 in)
Ring-to-groove side clearance (Second):0.045 mm (0.0018 in)
Ring-to-groove side clearance (Oil):0.090-0.150 mm (0.0035-0.0060 in)
Ring end gap (Top):0.250-0.400 mm (0.0100-0.0160 in)
Ring end gap (Second):0.640-0.800 mm (0.025-0.032 in)
Crankshaft main journal diameter: PTO end: 34.975-34.989 mm (1.3770-1.3775 in)
Flywheel end: 35.009-35.027 mm (1.3783-1.3790 in)
Crankpin journal diameter:36.975-36.985 mm (1.4557-1.4561 in)
Cylinder head
Valve arrangement:OHV
Valve head diameter (INTAKE):35.875-36.125 mm (1.4124-1.4222 in)
Valve head diameter (EXHAUST):32.875-33.125 mm (1.2943-1.3041 in)
Valve length (INTAKE):86.175-86.375 mm (3.3927-3.4006 in)
Valve length (EXHAUST):86.341-86.541 mm (3.3993-3.4071 in)
Valve seat angle (INTAKE):89.5°-90.5°
Valve seat angle (EXHAUST):89.5°-90.5°
Valve seat angle (INTAKE):89.5°-90.5°
Valve seat angle (EXHAUST):89.5°-90.5°
Valve steam diameter (INTAKE):6.560-6.575 mm (0.2583-0.2589 in)
Valve steam diameter (EXHAUST):6.545-6.560 mm (0.2577-0.2583 in)
Cam lobe profile (INTAKE):32.286 mm (1.271 in)
Cam lobe profile (EXHAUST):32.506 mm (1.280 in)

Tightening torque specs

Tightening torque specs
Connecting rod20.0 Nm (2.0 kgf·m; 14.8 lb·ft)
Cylinder head (torque in 2 increments) Step 1: 25.0 Nm (2.6 kgf·m; 18.5 lb·ft)
Step 2: 57.5 Nm (5.9 kgf·m; 42.4 lb·ft)
Flywheel113.0 Nm (11.5 kgf·m; 83.4 lb·ft)
Spark plug27.0 Nm (2.75 kg·m; 20.0 lb·ft)

Service Data

Valve lash
Intake/Exhaust:0.0762-0.1270 mm (0.0030-0.0050 in)
Oil system
Lubrication system:Splash type
Oil type:API SJ or higher
Recommended oil:SAE 10W-30
Oil capacity:1.1 liters (1.16 US.qts, 0.97 Imp. qts)
Fuel system
Type:Electronic Fuel Injection (EFI)
Fuel filter:In-line fuel filter
Ignition system
Type:Electronically controlled ignition system
Spark plug: Kohler 25 132 27-S, 25 132 32-S,
Champion RC12LC4, RC14MCX4
Spark plug gap: Kohler 25 132 27-S, Champion RC12LC4: 1.02 mm (0.040 in)
Kohler 25 132 32-S, Champion RC14MCX4: 1.11 mm (0.044 in)


1. Kohler Command PRO EFI ECH440 & ECH440LE service manual. Kohler Co. 2022.

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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