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Home / Small Engines / Kohler Engines / Kohler M18 |
Kohler M18 Specifications
Engine Model: Kohler Magnum M18 |
Engine Type: 4-cycle twin-cylinder air-cooled gasoline engine |
Total Displacement: 42.2 cu.in (691.3 cc) |
Rated Engine Power: 18.0 Hp (13.4 kW) at 3600 rpm |
Carburetor Type: Adjustable or fixed main jet |
![](images/Kohler_M18.jpg)
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General Technical Data |
Engine Model .............. Kohler Magnum M18/M18S
Engine Type .............. Gasoline, 4-cycle twin cylinder air-cooled
Number of Cylinders .............. 2
Displacement, cc (cu.in) .............. 691.3 (42.2)
Engine Bore, mm (in) .............. 79 (3.12)
Engine Stroke, mm (in) .............. 70 (2.75)
Rated Engine Power, hp (kW) .............. 18.0 (13.4)
Rated Engine Speed, rpm .............. 3600
Idle Speed, rpm .............. 1200
Compression .............. 6.0:1
Lubrication .............. Full pressure
Oil filter .............. Full-flow type
Air Cleaner .............. Replaceable, paper element
Ignition Type .............. Electronic
Electrical System Rating, Volts .............. 12
Starter Type .............. Electric
Fuel System |
Fuel System Type .............. Carburetor
Carburetor Model .............. Kohler or Walbro
Carburetor Type .............. Adjustable main jet or fixed jet
Fuel Pump Type .............. Mechanical
Fuel Filter Type .............. In-line
Governor Type .............. Mechanical
Dimensions and Weight |
Length, mm (in) .............. 341 (13.5)
Width, mm (in) .............. 448 (17.7)
Height, mm (in) .............. 440 (17.4)
Net weight, kg (lbs) .............. 59.0 (130)
Cylinder Block |
Cylinder Bore Inside Diameter (Std), mm (in) .............. 79,075-79,050 (3,1255-3,1245)
Cylinder Bore Inside Diameter (Max. Wear Limit), mm (in) .............. 79,1384 (3,128)
Cylinder Bore (Max Out of Round), mm (in) .............. 0,0506 (0,002)
Cylinder Bore (Max. Taper), mm (in) .............. 0,03795 (0,0015)
Camshaft End Play, mm (in) .............. 0,0759-0,3289 (0,003-0,013)
Connecting Rod to Crankpin Clearance (Std), mm (in) .............. 0,0304-0,0608 (0,0012-0,0024)
Connecting Rod to Crankpin Clearance (Wear Limit), mm (in) .............. 0,07337 (0,0029)
Connecting Rod to Piston Pin Clearance (Std), mm (in) .............. 0,0152-0,0278 (0,0006-0,0011)
Connecting Rod Small End I.D. (Std), mm (in) .............. 15,825-15,833 (0,6255-0,6258)
Cylinder Head and Valves |
Cylinder Head (Max. Out of Flatness), mm (in) .............. 0,0759 (0,003)
Intake Valve Clearance, mm (in) .............. 0,08-0,16 (0,003-0,006)
Exhaust Valve Clearance, mm (in) .............. 0,28-0,35 (0,011-0,014)
Valves Guide Reamer Size, mm (in) .............. 7,90625 (0,3125)
Intake Valve Tappet Clearance (Cold), mm (in) .............. 0,076-0,152 (0,003-0,006)
Exhaust Valve Tappet Clearance (Cold), mm (in) .............. 0,278-0,354 (0,011-0,014)
Intake Valve Minimum Lift (Zero Lash), mm (in) .............. 6,9322 (0,274)
Exhaust Valve Minimum Lift (Zero Lash), mm (in) .............. 6,9322 (0,274)
Intake Valve Stem O.D (Minimum), mm (in) .............. 7,85059 (0,3103)
Exhaust Valve Stem O.D (Minimum), mm (in) .............. 7,81264 (0,3088)
Nominal Valve Seat Angle (earlier), deg .............. 45
Nominal Valve Seat Angle (later), deg .............. 30
Intake Valve Guide I.D (Max. Wear), mm (in) .............. 0,1265 (0,005)
Exhaust Valve Guide I.D (Max. Wear), mm (in) .............. 0,1771 (0,007)
Piston and Piston Rings |
Piston Thrust Face O.D (Std), mm (in) .............. 78,961-78,944 (3,1210-3,1203)
Piston Thrust Face O.D (Max. Wear Limits), mm (in) .............. 78,8879 (3,1181)
Piston Thrust Face to Bore Clearance (Std), mm (in) .............. 0,0886-0,1312 (0,0035-0,0052)
Piston Ring End Gap (Std Bore), mm (in) .............. 0,253-0,582 (0,010-0,023)
Piston Ring End Gap (Used Bore), mm (in) .............. 0,8096 (0,032)
Max. Piston Ring Side Clearance, mm (in) .............. 0,1518 (0,006)
Piston Pin Outside Diameter, mm (in) .............. 15,805-15,810 (0,6247-0,6249)
Crankshaft |
Crankshaft End O.D (Std), mm (in) .............. 44,052-44,078 (1,7412-1,7422)
Crankshaft End O.D (Max Wear Limit), mm (in) .............. 44,03971 (1,7407)
Crankshaft Max. Out of Round (Sleeve), mm (in) .............. 0,01265 (0,0005)
Crankshaft Max. Taper (Sleeve), mm (in) .............. 0,0253 (0,001)
Crankshaft Main Running Clearance (Max Std), mm (in) .............. 0,12397 (0,0049)
Crankshaft Main Running Clearance (Wear Limit), mm (in) .............. 0,14927 (0,0059)
Crankshaft Main Bearing I.D (Installed), mm (in) .............. 44,121-44,176 (1,7439-1,7461)
Crankpin O.D (Std), mm (in) .............. 34,757-34,744 (1,3738-1,3733)
Crankpin O.D (Max. Wear Limit), mm (in) .............. 34,73184 (1,3728)
Crankpin (Max. Out of Round), mm (in) .............. 0,01265 (0,0005)
Crankpin (Max. Taper), mm (in) .............. 0,0253 (0,001)
Crankshaft End Play, mm (in) .............. 0,051-0,354 (0,002-0,014)
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