Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 49Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 49

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Specifications Type Spark Plug Type (NGK) Spark Plug Gap Firing Order Ignition Timing: Fully Relarded (Below 800 RPM) Fully Advanced (6000 RPM) Charge Coil Resistance Crank Position Sensor Resistance