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Kohler Command PRO CH440

General Technical Data

Kohler CH440 Engine Specifications

Engine Model .................. Kohler Command PRO CH440
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) .................. 26.8 (19.9)
Torque Speed, rpm .................. 2600
Compression Ratio .................. 8.0:1
Lubrication System .................. Splash type
Air Cleaner Type .................. Replaceable, paper element
Ignition System .................. Electronic
Oil Capacity, L (qts) .................. 1.30 (1.37)
Fuel Tank Capacity, L (qts) .................. 7.3 (7.7)
Electrical System Rating, Volts .................. 12
Starter Type .................. Electric

Fuel System

Fuel System Type .................. Carburetor
Carburetor Type .................. Fixed main jet
Fuel Filter Type .................. In-line
Governor Type .................. Mechanical

Dimensions and Weight

Overall Length, mm (in) .................. 411 (16.2)
Overall Width, mm (in) .................. 452 (17.8)
Overall Height, mm (in) .................. 443 (17.4)
Net Weight, kg (lbs) .................. 34.0 (74.9)

Kohler CH440 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) .................. 1.30 (1.37)

Carburetor Adjustment

Main Fuel .................. Not adjustable
Idle Fuel .................. Not adjustable
Low Idle Speed, rpm .................. 1800±150
High Idle Speed, rpm .................. 3600±150

Ignition System

Spark Plug Type .................. Champion RC12YC
Spark Plug Gap, mm (in) .................. 0.76 (0.030)
Module Air Gap, mm (in) .................. 0.254 (0.010)
Thread Size, mm (in) .................. 14 (0.55)
Spark Plug Torque, Nm (ft-lb) .................. 27 (20)

Service Intervals

Service Quad-Clean Precleaner .................. Every 50 hours
Clean Low-Profile Air Cleaner Element .................. Every 100 hours
Change Engine Oil .................. Every 100 hours
Clean Cooling Areas .................. Every 100 hours
Replace Quad-Clean Air Cleaner Element .................. Every 200 hours
Replace Low-Profile Air Cleaner Element .................. Every 300 hours
Clean Fuel Filters .................. Every 300 hours
Check and Adjust Valve Clearance .................. Every 300 hours
Replace Fuel Filters .................. Every 500 hours
Replace Spark Plug .................. Every 500 hours

Kohler CH440 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)
Ball Bearing Internal Clearance .................. 0.006-0.020 mm (0.0002-0.0008 in)
Crankshaft Runout (Either End) .................. 0.025 mm (0.001 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)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness) .................. 0.1 mm (0.004 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)
Intake Valve Guide Reamer Size .................. 6.608 mm (0.2602 in)
Exhaust Valve Guide Reamer Size .................. 6.608 mm (0.2602 in)
Intake Valve Seat Width .................. 1.20 mm (0.0472 in)
Exhaust Valve Seat Width .................. 1.20 mm (0.0472 in)
Intake Valve Seat Angle .................. 89.5-90.5 deg
Exhaust Valve Seat Angle .................. 89.5-90.5 deg
Intake Valve Face Angle .................. 45
Exhaust Valve Face Angle .................. 45
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)
Camshaft Bearing Surface O.D (Standard) .................. 15.975 mm (0.63 in)
Camshaft Bearing Surface O.D (Wear Limit) .................. 15.90 mm (0.626 in)
Cam Lobe Height (Intake) .................. 33.266 mm (1.310 in)
Cam Lobe Height (Exhaust) .................. 32.642 mm (1.285 in)

Piston and Piston Rings

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 .................. 0.250-0.400 mm (0.010-0.016 in)
Center Compression Ring End Gap .................. 0.640-0.800 mm (0.025-0.032 in)
Oil Control Ring Groove Clearance .................. 0.09-0.15 mm (0.0035-0.0059 in)

Governor

Governor Cross Shaft Bore I.D. .................. 8.000-8.024 mm (0.3150-0.3159 in)
Governor Cross Shaft to Crankcase Clearance .................. 0.020-0.069 mm (0.0008-0.0027 in)
Governor Cross Shaft O.D .................. 7.955-7.980 mm (0.3132-0.3142 in)
Governor Gear Shaft to Governor Gear Clearance .................. 0.022-0.134 mm (0.0009-0.0053 in)
Governor Gear Shaft O.D .................. 6.016-6.028 mm (0.2368-0.2373 in)

Tightening Torque Specs

Cylinder Head Nut, Nm (ft-lb) .................. 12-24 (8.9-17.7)
Connecting Rod Screw, Nm (ft-lb) .................. 12 (8.9)
Flywheel Retaining Nut, Nm (ft-lb) .................. 74 (54.8)
Rocker Arm Stud, Nm (ft-lb) .................. 13.6 (10)
Carburetor Stud, Nm (ft-lb) .................. 10 (7.4)
Carburetor Primary Nut, Nm (ft-lb) .................. 8 (5.9)
Oil Drain Plug, Nm (ft-lb) .................. 18 (13.3)
Closure Plate Screw, Nm (ft-lb) .................. 24 (17.7)
Fuel Tank Mounting Nut, Nm (ft-lb) .................. 24 (17.7)
Spark Plug, Nm (ft-lb) .................. 22-27 (16.3-20)
Ignition Module, Nm (ft-lb) .................. 10 (7.4)
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)
Governor Lever Nut, Nm (ft-lb) .................. 12 (8.9)
Throttle Control Lever Nut, Nm (ft-lb) .................. 9 (6.7)