1993 Johnson Evinrude "ET" 40 thru 55 Service Repair Manual, P/N 508283, Page 109Get this manual

1993 Johnson Evinrude "ET" 40 thru 55 Service Repair Manual, P/N 508283, Page 109

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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 fouled Before installing