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Kohler ECH650 Engine

The Kohler ECH650 is a 4-cycle V-twin cylinder OHV horizontal shaft air-cooled gasoline engine from Command PRO EFI series. A 42.4 cubic inches (0.7 L) engine has a cylinder bore of 3.15" (88 mm), piston stroke of 2.72" (69 mm), and rated power of 21 Hp (15.7 kW) at 3600 rpm. The compression ratio rating is 8.7:1. The Kohler ECH650 engine is equipped with an electronic fuel injection system, pressurized lubrication system, electronic spark ignition, paper element air cleaner, and bendix type electric starter. The operating weight is 108 lbs (49 kg).

General Technical Data

Engine Specifications

Engine Model .................. Kohler Command PRO ECH650 EFI
Engine Type .................. 4-cycle V-Twin cylinder air-cooled gasoline
Number of Cylinders .................. 2
Displacement, cc (cu.in) .................. 694 (42.4)
Cylinder Bore, mm (in) .................. 80.0 (3.15)
Piston Stroke, mm (in) .................. 69.0 (2.72)
Rated Engine Power, hp (kW) .................. 21.0 (15.7)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 46.8 (34.5)
Torque Speed, rpm .................. 2600
Compression Ratio .................. 8.7:1
Fuel System .................. Electronic fuel injection (EFI)
Lubrication System .................. Full pressure
Oil Filter Type .................. Full-flow type
Cooling System .................. Forced-air
Air Cleaner Type .................. Replaceable, paper element
Ignition System .................. Electronic
Starter Type .................. Electric
Electrical System Rating, Volts .................. 12

Dimensions and Weight

Overall Length, mm (in) .................. 375 (14.8)
Overall Width, mm (in) .................. 480 (18.9)
Overall Height, mm (in) .................. 622 (24.5)
Net Weight, kg (lbs) .................. 49 (108)

Maintenance Data

Engine Oil

Engine Oil Type (Summer Time) .................. SAE 10W-30, Kohler PRO 10W-50
Engine Oil Type (Winter Time) .................. SAE 5W-30
Oil Classification (API Service) .................. SJ or higher
Oil Capacity (w/o Filter), L (qts) .................. 1.7 (1.8)
Oil Capacity (with New Filter), L (qts) .................. 1.9 (2.0)

Ignition System

Spark Plug Type .................. Champion RC12YC or XC12YC
Spark Plug Gap, mm (in) .................. 0.76 (0.030)
Module Air Gap, mm (in) .................. 0.28-0.33 (0.011-0.013)
Thread Size, mm (in) .................. 14 (0.55)
Spark Plug Torque, Nm (ft-lbs) .................. 27 (20)

Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Standard), mm (in) .................. 80.000-80.025 (3.1496-3.1506)
Cylinder Bore Inside Diameter (Wear Limit), mm (in) .................. 80.065 (3.1522)
Cylinder Bore (Max Out of Round), mm (in) .................. 0.12 (0.0047)
Crankshaft End Play (Free), mm (in) .................. 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore Outside Diameter (Crankcase), mm (in) .............. 40.972-40.997 (1.6131-1.6141)
Crankshaft Bore Outside Diameter (Closure Plate), mm (in) .......... 40.974-41.000 (1.6131-1.6141)
Crankshaft Bearing Journal Outside Diameter (Flywheel), mm (in) .............. 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Flywheel), mm (in) .................. 0.022 (0.0009)
Crankshaft Bearing Journal Outside Diameter (Closure Plate), mm (in) .......... 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Closure Plate), mm (in) .................. 0.022 (0.0009)
Connecting Rod to Crankpin Side Clearance, mm (in) .................. 0.26-0.63 (0.0102-0.0248)
Connecting Rod to Piston Pin Running Clearance, mm (in) .................. 0.015-0.028 (0.0006-0.0011)
Connecting Rod Journal Outside Diameter, mm (in) .................. 35.950-35.973 (1.4153-1.4163)
Connecting Rod Journal Max Taper, mm (in) .................. 0.018 (0.0007)
Piston to Piston Pin Running Clearance, mm (in) .................. 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore Inside Diameter, mm (in) .................. 17.006-17.012 (0.6695-0.6698)
Piston Pin Outside Diameter, mm (in) .................. 16.995-17.000 (0.6691-0.6693)
Piston Thrust Face Outside Diameter (Piston A), mm (in) .................. 79.943-79.961 (3.1473-3.1480)
Top Ring Groove Clearance (Piston A), mm (in) .................. 0.050-0.095 (0.0019-0.0037)
Middle Ring Groove Clearance (Piston A), mm (in) .................. 0.030-0.076 (0.0012-0.0031)
Oil Ring Groove Clearance (Piston A), mm (in) .................. 0.010-0.110 (0.0004-0.0043)
Top Ring End Gap (Piston A), mm (in) .................. 0.250-0.560 (0.0100-0.0224)
Middle Ring End Gap (Piston A), mm (in) .................. 0.250-0.560 (0.0100-0.0224)
Piston Thrust Face Outside Diameter (Piston B), mm (in) .................. 79.966 (3.1481)
Top Ring Groove Clearance (Piston B), mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Middle Ring Groove Clearance (Piston B), mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Oil Ring Groove Clearance (Piston B), mm (in) .................. 0.060-0.190 (0.0022-0.0073)
Top Ring End Gap (Piston B), mm (in) .................. 0.100-0.279 (0.0039-0.0110)
Middle Ring End Gap (Piston B), mm (in) .................. 1.400-1.679 (0.0551-0.0661)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness), mm (in) .................. 0.076 (0.003)
Intake Valve Head Diameter, mm (in) .................. 33.37-33.63 (1.3138-1.3240)
Exhaust Valve Head Diameter, mm (in) .................. 29.37-29.63 (1.1563-1.1665)
Intake Valve Stem Diameter, mm (in) .................. 6.982-7.000 (0.2749-0.2756)
Exhaust Valve Stem Diameter, mm (in) .................. 6.970-6.988 (0.2744-0.2751)
Intake Valve Stem to Valve Guide Clearance, mm (in) .................. 0.040-0.078 (0.0016-0.0031)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) .................. 0.052-0.090 (0.0020-0.0035)
Intake Valve Guide Inside Diameter, mm (in) .................. 7.040-7.060 (0.2772-0.2780)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 7.040-7.060 (0.2772-0.2780)
Intake Valve Minimum Lift, mm (in) .................. 8.07 (0.3177)
Exhaust Valve Minimum Lift, mm (in) .................. 8.07 (0.3177)
Camshaft End Play, mm (in) .................. 0.101-0.406 (0.0040-0.0160)
Camshaft Running Clearance, mm (in) .................. 0.025-0.105 (0.001-0.004)
Camshaft Bore Inside Diameter, mm (in) .................. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Outside Diameter, mm (in) .................. 19.920-19.975 (0.7843-0.7864)

Tightening Torque Specs

Cylinder Head Nut, Nm (ft-lb) .................. 16.9-33.9 (12.5-25.1)
Cylinder Head Bolt, Nm (ft-lb) .................. 22.6-41.8 (16.7-30.8)
Rocker Arm Screw, Nm (ft-lb) .................. 18.1 (13.3)
Connecting Rod Cap, Nm (ft-lb) .................. 11.3 (8.3)
Flywheel Retaining Screw, Nm (ft-lb) .................. 71.6 (52.8)
Governor Lever Nut, Nm (ft-lb) .................. 7.1 (5.2)
Ignition ECU, Nm (ft-lb) .................. 6.2 (4.6)
Fuel Pump Module, Nm (ft-lb) .................. 9.2 (6.8)
Intake Manifold Mounting, Nm (ft-lb) .................. 7.8 (5.7)
Valve Cover, Nm (ft-lb) .................. 9 (6.6)
Muffler Retaining Nut, Nm (ft-lb) .................. 27.8 (20.4)
Closure Plate, Nm (ft-lb) .................. 25.6 (18.8)
Spark Plug, Nm (ft-lb) .................. 27 (20.1)

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