1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Manual, Page 102Get this manual
Spark Plug Information The spark plugs should be removed and examinedA 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 Tripe-Guard grease to the ribbed portion ofthe spark plug ceramic and to the opening of the spark plug coverThis will help prevent corrosion ofthe spring terminal on the spark plug which can cause high tension arcingSpark Plug, Champion Sustained High Speed OL16V Fixed Gap OL78V Fixed Gap