The Mercury 9.9 HP outboard motor, produced between 1986 and 1987, is a robust marine propulsion system engineered for reliability and performance. Featuring a 2-cylinder, 210cc gasoline engine with a CDI ignition and water-cooling system, this motor delivers 9.9 HP, making it suitable for a variety of watercraft and boating applications. Its outboard motor transmission offers Forward, Neutral, and Reverse gears for versatile maneuverability on the water. This Service Repair Manual provides comprehensive guidance for maintaining and repairing your Mercury 9.9 HP outboard motor. It covers essential procedures, including lubrication with 2-stroke outboard oil, fuel filter replacement, and annual or 100-hour gear lube changes. Detailed technical specifications and troubleshooting information are included to assist owners and technicians in ensuring optimal performance and longevity of the unit.