TP-5393 9/93 Specifications 1-3
Engine
Some general engine specificationsare listedbelow. Refer to the appropriate servicesection and the engineservice
manual for specific service details.
4CKM/CFKM/
4CKMR/CFKMR
5CKM/
5CKMR
Manufacturer Kohler
Model M18 M20
Cycle 4
Number Cylinders 2
Compression Ratio 6.0:1 6.6:1
Displacement—cu.in. (L) 42.18 (0.69) 46.98 (0.77)
Rated Horsepower:
60 Hz 8.9 9.5
50 Hz 7.4 7.9
RPM:
60 Hz 1800
50 Hz 1500
Bore—in. (mm) 3.12 (79.25) 3.12 (79.25)
Stroke—in. (mm) 2.75 (69.85) 3.06 (77.72)
Valve Material Stelliteâ
Valve Clearance—in. (mm):
Intake 0.003-0.006 (0.076-0.152)
Exhaust 0.011-0.014 (0.279-0.355)
Cylinder Block Material Aluminum crankcase with cast iron cylinders
Cylinder Head Tightening Torque—ft. lbs (Nm) 15-20 (20-27)
Cylinder Head Material Aluminum
Piston Rings 2 Compression/ 1 Oil
Crankshaft Material Heat treated ductile iron casting
Bearings, Number & Type 2, Replaceable Sleeve
Governor Electronic
Lubrication System Full Pressure
Oil Capacity (with filter)—qts. (L) 1.5 (1.4) 2.5 (2.36)
Oil Type (API) SF
Oil Pressure—psi (kPa) 30-40 (207-276)
Fuel Type:
Gasoline 87 Octane Unleaded
LP Vapor Gas (Inlet Pressure) 4-6 oz. per sq. in.
LP Liquid Withdrawal 50 psi
Battery Voltage 12
Battery Ground Negative
Battery Recommendation (min.) 290 Cold Cranking Amps/90 Amp Hr.
Spark Plug Type Championâ RV17YC
Spark Plug Gap:
Gasoline—in. (mm) 0.025 (0.64)
LP Gas—in. (mm) 0.018 (0.46)
Spark Plug Tightening Torque—ft. lbs (Nm) 10-15 (13.6-20)
Ignition System Electronic
Ignition Module to Magnet Air Gap 0.008-0.012
Starter Motor Bendix-drive electric starter motor
Cranking current at 70° F. 100 Amps
Cooling System Air-Cooled
Intake Manifold Bolt Torque—ft. lbs. (Nm) 12.5 (17)
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