Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 32Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 32

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GENERAL INFORMATION
Engine Compression
Engine compression should be checked with engine block warm, throttle shutter wide open, all spark plugs removed and using fully charged batteryNorma