1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 7Get this manual
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SPECIFICATIONS
MercuryMariner 9.9 (4 Stroke) Bigfoot
Wide Open Throttle rpm: 4500-5500 Recommended Transom Heights20", 25" Right Hand Rotation Standard Gear Reduction2.42:1 Noof Blades App