Mercury Force 9.9, 15HP Outboards Service Manual, Page 9Get this manual
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SPECIFICATIONS1993 and Newer 9.9H.PISO Prop Shaft Horsepower RECOMMENDED OPERATING RANGE IDLE RPM IN GEAR ENGINE TYPE BORE and STROKE DISPLACEMENT COMPR ESSION SPARK PLUG 9.9 4500 RPM 4000-5000 RPM