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Kohler CH682 Engine

The Kohler CH682 is a four-stroke V-twin cylinder OHV horizontal shaft air-cooled small gasoline engine from Command PRO series. A 42.4 cu. in (694 cc) engine has a cylinder bore of 3.15" (80 mm), piston stroke of 2.72" (69 mm), and rated power of 22.5 Hp (16.8 kW) at 3600 rpm. The compression ratio rating is 8.7:1. The Kohler CH682 engine is equipped with a pressurized lubrication system, two-barrel side-draft Walbro carburetor, electronic spark ignition, paper element air cleaner, and bendix type electric starter. The operating weight is 105 lbs (48 kg).

General Technical Data

Engine Specifications

Engine Model .................. Kohler Command PRO CH682
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) .................. 22.5 (16.8)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 52.7 (38.9)
Torque Speed, rpm .................. 3000
Compression Ratio .................. 8.7:1
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

Fuel System

Fuel System Type .................. Carburetor
Carburetor Model .................. Walbro
Carburetor Type .................. Two-barrel side-draft
Fuel Pump Type .................. Pulse/mechanical
Fuel Filter Type .................. In-line
Governor Type .................. Mechanical

Dimensions and Weight

Overall Length, mm (in) .................. 371 (14.6)
Overall Width, mm (in) .................. 451 (17.7)
Overall Height, mm (in) .................. 622 (24.5)
Net Weight, kg (lbs) .................. 48 (105)

Maintenance Data

Engine Oil

Engine Oil Type (Summer Time) .................. SAE 10W-30
Engine Oil Type (Winter Time) .................. SAE 5W-30
Oil Classification (API Service) .................. SG, SH, 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
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 Bearing Journal O.D (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 O.D (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 Journal O.D, mm (in) .................. 35.955-35.973 (1.4156-1.4163)
Connecting Rod Journal Max Taper, mm (in) .................. 0.018 (0.0007)
Piston to Piston Pin 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)
Top Ring Groove Clearance, mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Middle Ring Groove Clearance, mm (in) .................. 0.030-0.076 (0.0012-0.0030)
Oil Ring Groove Clearance, mm (in) .................. 0.060-0.190 (0.0022-0.0073)
Top Ring End Gap, mm (in) .................. 0.100-0.279 (0.0039-0.0110)
Middle Ring End Gap, mm (in) .................. 1.400-1.679 (0.0551-0.0661)
Piston Thrust Face O.D (Std), mm (in) .................. 79.963-79.979 (3.1481-3.1488)
Piston Thrust Face O.D (Wear Limit), mm (in) .................. 79.831 (3.1430)
Piston to Cylinder Bore Clearance, mm (in) .................. 0.021-0.062 (0.0008-0.0024)

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) .................. 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) .................. 0.050-0.088 (0.0020-0.0035)
Intake Valve Guide Inside Diameter, mm (in) .................. 7.038-7.058 (0.2771-0.2779)
Exhaust Valve Guide Inside Diameter, mm (in) .................. 7.038-7.058 (0.2771-0.2779)
Nominal Valve Face Angle, degrees .................. 45
Camshaft End Play, mm (in) .................. 0.076-0.127 (0.0030-0.0050)
Camshaft Clearance, mm (in) .................. 0.025-0.063 (0.0010-0.0025)
Camshaft Bore Inside Diameter, mm (in) .................. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Outside Diameter, mm (in) .................. 19.962-19.975 (0.7859-0.7864)

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) .................. 11.3 (8.3)
Connecting Rod Cap, Nm (ft-lb) .................. 11.3 (8.3)
Flywheel Retaining Screw, Nm (ft-lb) .................. 66.4 (49.1)
Intake Manifold Mounting, Nm (ft-lb) .................. 7.4 (5.5)
Carburetor Mounting Nut, Nm (ft-lb) .................. 6.2-7.3 (4.6-5.4)
Closure Plate, Nm (ft-lb) .................. 24.4 (18.1)
Oil Drain Plug, Nm (ft-lb) .................. 13.6 (10.1)
Governor Lever Nut, Nm (ft-lb) .................. 6.8 (5.1)
Ignition Module, Nm (ft-lb) .................. 4.0-6.2 (2.9-4.6)
Muffler Retaining Nut, Nm (ft-lb) .................. 24.4 (18.1)
Fuel Pump Screw, Nm (ft-lb) .................. 2.3 (1.7)
Spark Plug, Nm (ft-lb) .................. 27 (20.1)

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