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Kohler ECH440 Engine

The Kohler ECH440 is a 4-cycle single cylinder OHV horizontal shaft air-cooled gasoline engine from Command PRO EFI series. A 24.7 cubic inches (0.43 L) engine has a cylinder bore of 3.50" (89 mm), piston stroke of 2.72" (69 mm), and rated power of 10.5 Hp (14 kW) at 3600 rpm. The compression ratio rating is 8:1. The Kohler ECH440 engine is equipped with an electronic fuel injection system, splash type lubrication system, electronic spark ignition, paper element air cleaner, and recoil starter. The operating weight is 73 lbs (33 kg).

General Technical Data

Engine Specifications

Engine Model .................. Kohler Command PRO ECH440 EFI
Engine Type .................. 4-cycle OHV single cylinder air-cooled gasoline
Number of Cylinders .................. 1
Displacement, cc (cu.in) .................. 429 (24.7)
Cylinder Bore, mm (in) .................. 89.0 (3.50)
Piston Stroke, mm (in) .................. 69.0 (2.72)
Rated Engine Power, hp (kW) .................. 10.5 (14.0)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 30.8 (22.7)
Torque Speed, rpm .................. 2800
Compression Ratio .................. 8.0:1
Fuel System .................. Electronic fuel injection (EFI)
Lubrication System .................. Splash type
Cooling System .................. Forced-air
Air Cleaner Type .................. Replaceable, paper element
Ignition System .................. Electronic
Electrical System Rating, Volts .................. 12
Starter Type .................. Recoil

Dimensions and Weight

Overall Length, mm (in) .................. 325 (12.7)
Overall Width, mm (in) .................. 452 (17.8)
Overall Height, mm (in) .................. 467 (18.4)
Net Weight, kg (lbs) .................. 33.0 (72.9)

Maintenance Data

Engine Oil

Engine Oil Type (Summer Time) .................. SAE 10W-30
Engine Oil Type (Winter Time) .................. SAE 5W-20, 5W-30
Engine Oil Classification (API Service) .................. SJ or higher
Engine Oil Capacity, L (qts) .................. 1.10 (1.15)

Ignition System

Spark Plug Type .................. Champion RC12LC4, RC14MCX4, Kohler 25 132 27-S
Spark Plug Gap (RC12LC4), mm (in) .................. 1.02 (0.040)
Spark Plug Gap (RC14MCX4), mm (in) .................. 1.11 (0.044)
Thread Size, mm (in) .................. 14 (0.55)
Spark Plug Torque, Nm (ft-lb) .................. 27 (20)

Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) .................. 89.00-89.02 mm (3.5039-3.5045 in)
Cylinder Bore I.D (Wear Limit) .................. 89.185 mm (3.5112 in)
Cylinder Bore I.D (Max Out of Round) .................. 0.0127 mm (0.0005 in)
Crankshaft O.D .................. 34.975-34.989 mm (1.3770-1.3775 in)
Crankshaft Main Bearing I.D .................. 34.990-35.000 mm (1.3776-1.3780 in)
Crankpin End I.D (Standard) .................. 33.020-33.030 mm (1.3000-1.3004 in)
Crankpin End I.D (Wear Limit) .................. 37.08 mm (1.460 in)
Crankshaft End Play (Free) .................. 0.0508-0.254 mm (0.002-0.010 in)
Connecting Rod to Crankpin Clearance .................. 0.56 mm (0.022 in)
Connecting Rod to Piston Pin Clearance .................. 0.008-0.025 mm (0.0003-0.0010 in)
Connecting Rod Journal O.D (Standard) .................. 36.975-36.985 mm (1.4557-1.4561 in)
Connecting Rod Journal O.D (Wear Limit) .................. 36.92 mm (1.4535 in)
Piston O.D (Standard) .................. 88.955-88.975 mm (3.502-3.503 in)
Piston O.D (Wear Limit) .................. 88.82 mm (3.497 in)
Piston Pin O.D (Standard) .................. 19.992-19.998 mm (0.7871-0.7873 in)
Piston Pin O.D (Wear Limit) .................. 19.95 mm (0.7854 in)
Piston to Piston Pin Clearance .................. 0.002-0.016 mm (0.0001-0.0006 in)
Piston Pin Bore I.D (Standard) .................. 20.000-20.008 mm (0.7874-0.7877 in)
Piston Pin Bore I.D (Wear Limit) .................. 20.05 mm (0.7894 in)
Piston to Cylinder Bore Clearance .................. 0.025-0.060 mm (0.001-0.002 in)
Piston Pin End I.D (Standard) .................. 20.000-20.008 mm (0.7874-0.7874 in)
Piston Pin End I.D (Wear Limit) .................. 20.05 mm (0.789 in)
Top Compression Ring Groove Clearance .................. 0.045 mm (0.0018 in)
Center Compression Ring Groove Clearance .................. 0.045 mm (0.0018 in)
Top Compression Ring End Gap .................. 0.090-0.150 mm (0.0035-0.0060 in)
Center Compression Ring End Gap .................. 0.250-0.400 mm (0.0100-0.0160 in)
Oil Control Ring Groove Clearance .................. 0.640-0.800 mm (0.025-0.032 in)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness) .................. 0.1 mm (0.004 in)
Intake Valve Clearance .................. 0.0762-0.1270 mm (0.0030-0.0050 in)
Exhaust Valve Clearance .................. 0.0762-0.1270 mm (0.0030-0.0050 in)
Intake Valve Head Diameter .................. 35.875-36.125 mm (1.4124-1.4222 in)
Exhaust Valve Head Diameter .................. 32.875-33.125 mm (1.2943-1.3041 in)
Intake Valve Length .................. 86.175-86.375 mm (3.3927-3.4006 in)
Exhaust Valve Length .................. 86.341-86.541 mm (3.3993-3.4071 in)
Intake Valve Stem to Guide Clearance .................. 0.025-0.055 mm (0.0010-0.0022 in)
Exhaust Valve Stem to Guide Clearance .................. 0.040-0.07 mm (0.0016-0.0026 in)
Intake Valve Stem O.D (Standard) .................. 6.57 mm (0.259 in)
Intake Valve Stem O.D (Wear Limit) .................. 6.40 mm (0.252 in)
Exhaust Valve Stem O.D (Standard) .................. 6.55 mm (0.258 in)
Exhaust Valve Stem O.D (Wear Limit) .................. 6.41 mm (0.252 in)
Camshaft Bore I.D (Standard) .................. 16.000-16.018 mm (0.6300-0.6310 in)
Camshaft Bore I.D (Wear Limit) .................. 16.068 mm (0.6289 in)
Camshaft Running Clearance .................. 0.016-0.052 mm (0.0006-0.0020 in)
Cam Lobe Height (Intake) .................. 32.286 mm (1.271 in)
Cam Lobe Height (Exhaust) .................. 32.506 mm (1.280 in)

Tightening Torque Specs

Cylinder Head Nut, Nm (ft-lb) .................. 25-57.5 (18.3-42.3)
Connecting Rod Screw, Nm (ft-lb) .................. 20 (14.7)
Flywheel Retaining Nut, Nm (ft-lb) .................. 113 (83)
Rocker Arm Stud, Nm (ft-lb) .................. 13.6 (10)
Governor Lever Nut, Nm (ft-lb) .................. 12 (8.9)
Fuel Tank Mounting Nut, Nm (ft-lb) .................. 24 (17.7)
Ignition ECU, Nm (ft-lb) .................. 8 (5.9)
Spark Plug, Nm (ft-lb) .................. 22-27 (16.3-20)
Valve Cover, Nm (ft-lb) .................. 10 (7.4)
Quad-Clean Air Cleaner Screw, Nm (ft-lb) .................. 8 (5.9)
Low-Profile Air Cleaner Screw, Nm (ft-lb) .................. 6.7 (4.9)
Throttle Body Studs, Nm (ft-lb) .................. 10 (7.4)

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