Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 50Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 50

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IGNITION SYSTEM
IMPORTANT: To remove spark plug cap from high tension leads, turn cap counterclockwise while applying slight outward pressure00 NOT PULL HARD or lead may be damagedTo install cap