The Mercury Mariner 9.9 HP 2-Stroke outboard motor, produced between 1986 and 2003, represents a robust and reliable choice for a variety of marine applications. Engineered for dependable performance, this water-cooled engine features a CDI ignition system and a carbureted fuel delivery system, ensuring efficient operation. Its power output of 9.9 HP is suitable for a range of small to medium-sized watercraft, offering a balance of maneuverability and propulsion. The motor is equipped with a tiller handle for intuitive steering and offers both manual and optional electric trim and tilt capabilities for optimized performance and ease of use. This Service Repair Manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner 9.9 HP 2-Stroke outboard motor. It covers essential procedures for keeping your engine in optimal condition, including details on lubrication, spark plug replacement, water pump impeller service, and gear lube changes. Technical specifications and troubleshooting information are included to assist owners, mechanics, and technicians in diagnosing and resolving potential issues. Adhering to the guidelines within this manual will help ensure the longevity, reliability, and performance of your Mercury Mariner outboard.