Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 71Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 71

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IGNITION
TROUBLESHOOTIN TIP: With engine ru nning, use inductive timing light to check spark advance of each cylinder as throttle is opened and closedIf timing advances and retards on each cylin

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