1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 148Get this manual
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EMISSIONS
Spark Plug: NGK BP8H-N-15 Gap: .1.52 mm (0.060 in Valve Clearance (Cold) mm Exhaust: NA
FEL: 243.11 GMKW-HR
Intake: NA
9.915 HPJAN FEB MAR