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Kohler Command PRO CH270

General Technical Data

Kohler CH270 Engine Specifications

Engine Model .................. Kohler Command PRO CH270
Engine Type .................. 4-cycle OHV single cylinder air-cooled gasoline
Number of Cylinders .................. 1
Displacement, cc (cu.in) .................. 208 (12.7)
Cylinder Bore, mm (in) .................. 70.0 (2.76)
Piston Stroke, mm (in) .................. 54.0 (2.13)
Rated Engine Power, hp (kW) .................. 7.0 (5.2)
Rated Engine Speed, rpm .................. 3600
Maximum Torque, Nm (ft-lbs) .................. 12.8 (9.1)
Torque Speed, rpm .................. 2600
Compression Ratio .................. 8.5:1
Lubrication System .................. Splash type
Air Cleaner Type .................. Replaceable, paper element
Ignition System .................. Electronic
Oil Capacity, L (qts) .................. 0.60 (0.63)
Fuel Tank Capacity, L (qts) .................. 4.1 (4.3)
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) .................. 323 (12.7)
Overall Width, mm (in) .................. 385 (15.2)
Overall Height, mm (in) .................. 361 (14.2)
Net Weight, kg (lbs) .................. 17.5 (38.7)

Kohler CH270 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) .................. 0.60 (0.63)

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 CH270 Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) .................. 70.027-70.035 mm (2.757-2.757 in)
Cylinder Bore I.D (Wear Limit) .................. 70.200 mm (2.764 in)
Cylinder Bore I.D (Max Out of Round) .................. 0.0127 mm (0.0005 in)
Crankshaft O.D .................. 24.975-24.989 mm (0.9833-0.9838 in)
Crankshaft Main Bearing I.D .................. 24.992-25.000 mm (0.9839-0.9842 in)
Crankshaft Runout (Either End) .................. 0.025 mm (0.001 in)
Crankshaft End Play (Free) .................. 0.0508-0.254 mm (0.002-0.010 in)
Crankpin End I.D (Standard) .................. 30.021-30.026 mm (1.1819-1.1821 in)
Crankpin End I.D (Wear Limit) .................. 30.08 mm (1.184 in)
Ball Bearing Internal Clearance .................. 0.003-0.025 mm (0.0001-0.0010 in)
Connecting Rod to Crankpin Clearance .................. 0.58-0.60 mm (0.023-0.024 in)
Connecting Rod to Piston Pin Clearance .................. 0.008-0.025 mm (0.0003-0.0010 in)
Connecting Rod Journal O.D (Standard) .................. 30.020-30.030 mm (1.1819-1.1823 in)
Connecting Rod Journal O.D (Wear Limit) .................. 30.08 mm (1.1842 in)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness) .................. 0.08 mm (0.003 in)
Intake Valve Head Diameter .................. 26.875-27.125 mm (1.0581-1.0679 in)
Exhaust Valve Head Diameter .................. 24.875-25.125 mm (0.9793-0.9892 in)
Intake Valve Length .................. 63.3-63.9 mm (2.4921-2.5157 in)
Exhaust Valve Length .................. 63.3-63.9 mm (2.4921-2.5157 in)
Intake Valve Stem O.D (Standard) .................. 5.50 mm (0.217 in)
Intake Valve Stem O.D (Wear Limit) .................. 5.34 mm (0.210 in)
Exhaust Valve Stem O.D (Standard) .................. 5.438 mm (0.214 in)
Exhaust Valve Stem O.D (Wear Limit) .................. 5.28 mm (0.208 in)
Intake Valve Guide Reamer Size .................. 5.524 mm (0.2175 in)
Exhaust Valve Guide Reamer Size .................. 5.536 mm (0.2179 in)
Intake Valve Stem to Guide Clearance .................. 0.038-0.065 mm (0.0015-0.0026 in)
Exhaust Valve Stem to Guide Clearance .................. 0.085-0.112 mm (0.0033-0.0044 in)
Intake Valve Face Angle .................. 45 deg
Exhaust Valve Face Angle .................. 45 deg
Intake Valve Seat Angle .................. 89.5-90.5 deg
Exhaust Valve Seat Angle .................. 89.5-90.5 deg
Intake Valve Seat Width .................. 0.80 mm (0.0315 in)
Exhaust Valve Seat Width .................. 0.80 mm (0.0315 in)
Camshaft Running Clearance .................. 0.007-0.043 mm (0.0003-0.0017 in)
Camshaft Bore I.D (Standard) .................. 13.991-14.009 mm (0.5508-0.5515 in)
Camshaft Bore I.D (Wear Limit) .................. 14.018 mm (0.5519 in)
Camshaft Bearing Surface O.D (Standard) .................. 13.975 mm (0.55 in)
Camshaft Bearing Surface O.D (Wear Limit) .................. 13.90 mm (0.547 in)
Cam Lobe Height (Intake) .................. 31.966 mm (1.259 in)
Cam Lobe Height (Exhaust) .................. 31.966 mm (1.259 in)

Piston and Piston Rings

Piston O.D (Standard) .................. 69.970-69.960 mm (2.755-2.754 in)
Piston O.D (Wear Limit) .................. 69.82 mm (2.749 in)
Piston to Cylinder Bore Clearance .................. 0.057-0.075 mm (0.002-0.003 in)
Piston to Piston Pin Clearance .................. 0.009-0.016 mm (0.0003-0.0006 in)
Piston Pin Bore I.D (Standard) .................. 18.004-18.005 mm (0.7088-0.7089 in)
Piston Pin Bore I.D (Wear Limit) .................. 18.05 mm (0.7106 in)
Piston Pin O.D (Standard) .................. 17.992-17.995 mm (0.7083-0.7084 in)
Piston Pin O.D (Wear Limit) .................. 17.95 mm (0.7067 in)
Piston Pin End I.D (Standard) .................. 18.010-18.015 mm (0.7091-0.7093 in)
Piston Pin End I.D (Wear Limit) .................. 18.08 mm (0.712 in)
Top Compression Ring Groove Clearance .................. 0.04 mm (0.002 in)
Center Compression Ring Groove Clearance .................. 0.04 mm (0.002 in)
Top Compression Ring End Gap .................. 0.325-0.400 mm (0.013-0.016 in)
Center Compression Ring End Gap .................. 0.325-0.400 mm (0.013-0.016 in)
Oil Control Ring Groove Clearance .................. 0.05-0.19 mm (0.0019-0.0075 in)

Governor

Governor Cross Shaft Bore I.D .................. 6.000-6.024 mm (0.2362-0.2372 in)
Governor Cross Shaft to Crankcase Clearance .................. 0.020-0.069 mm (0.0008-0.0027 in)
Governor Cross Shaft O.D .................. 5.955-5.980 mm (0.2344-0.2354 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)