1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 108Get this manual
Spark Plug Information The spark plugs should be removed and examined spark plug should be replaced if the electrodes are badly worn, if it has cracked insulator, or is badly fouledBefore installing the spark plug cover, apply light coating of OMC Triple-Guard grease to the ribbed portion ofthe spark plug ceramic and to the opening of the spark plug coverTh is will help prevent corrosion ofthe spring terminal and the spark plug which can cause high tension arcingSpark Plug, Champion Sustained High Speed OL16V FIXED GAP OL78V FIXED GAP