This manual covers the Mercury Mariner outboard motor, produced from 1986 to 2003. Designed as a reliable and efficient 2-stroke engine, the Mariner offers 10 HP and features a water-cooled system with a carburetor fuel delivery. Its outboard motor design, with Forward, Neutral, and Reverse gears, makes it suitable for various marine applications. The engine utilizes a Capacitor Discharge (CD) ignition system and is available in Short (S) and Long (L) shaft configurations, demonstrating its versatile engineering for different boat types and operational needs. The purpose of this Factory Service Repair Manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard motor. It details essential procedures, technical specifications, and safety guidelines necessary for optimal performance and longevity. Owners, technicians, and mechanics will find detailed information on engine specifications, recommended fluids and parts like 2-stroke outboard oil and specific spark plug types, as well as critical maintenance schedules. This manual is an indispensable resource for ensuring the continued reliability and proper functioning of your marine propulsion system.