1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 98Get this manual
Specifications Idle RPM (In Forward Gear) Full Throttle RPM RangeModel 30, 40 Sea Pro, 40 MarathonModel 40 SPECIFICATIONS Spark Plug Type (NGK) Gap Optional Plug (NGK) Gap Firing Order Models with (SN-0G589999Below)Idle Maximum BTDC 2500-5500 RPM Models with (SN-0G590000Above)Idle Maximum Spark Advance
Suppressor (Inductor) Spark Plug
700-800 PM 4500-5500 PM 5000-5500 PM P8H-N-10 0.040 in(1.0mm) Z8H-N-10 0.040 in(1.0mm) 1-2 (Not Adjustable) 25 (Not Adjustable) BTDC Turn Clockwise After ontacting Throttle Plate