2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Repair Manual, PN 5005466, Page 74Get this manual
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IGNITION SAFETY INFORMATION
The spark plugs must be removed and examinedA spark plug must be replaced if the electrodes are badly worn, if it has cracked insulator, or is badly fouledBefore inst