1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 49Get this manual

1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 49

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Specifications IGNITION SYSTEM Type Spark Plug Type (NGK) Spark Plug Gap Optional Plug (NGK) Spark Plug Gap Firing Order Models With (SN-0G589999 Below) Idle Maximum BTDC 2500-5500 RPM (Not Adjustable