1989 Johnson Evinrude "CE" Colt/Junior thru 8 Service Manual, P/N 507753, Page 105Get 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 fouled Before 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