1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 115Get 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 Triple-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 and the spark plug which can cause high tension arcing
Spark Plug, Champion Sustained High Speed OL78V Fixed Gap OL78V Fixed Gap OL16V Fixed Gap OL78V Fixed Gap