1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 105Get 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 of the 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 arcingSpark Plug, Champion Model 40, 48, 50 Recommended OL78C 0.030 in(0,8 mm) 0L16V FIXED GAP Alternate Sustained High Speed 0L16V FIXED GAP Alternate