Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 91Get this manual
Specifications Type Spark Plug Type (NGK) Spark Plug Gap Firing Order Ignition Timing: Fully Retarded (Below 800 RPM) Fully Advanced (6000 RPM) Charge Coil Resistance Crank Position Sensor Resistance Ignition Coil Resistance: Primary Secondary (Wlo Boots) ECM Engine Speed limiter Soft Reduction (Retards Timing) Spark Cut-Out Reduction (Precentages of ignition spark are Cut-Out) ECM OverheatlLow Oil Pressure Speed Control Idle RPM (Out 01 Gear) Idle RPM (In Forward Gear) Wide Open Throttle RPM (WOT) Range Main Jet Size Pilot Jet Idle Jet Float Height
Capacitor Discharge Ignition NGK DPR6EA-9 0.035 in(1.0 mm) 1-2
IGNITION SYSTEM