This workshop service repair manual covers Mercury Mariner two-stroke outboard engines manufactured between 1986 and 2003, specifically models 6, 8, 8 Sail Mate, 9.9, 9.9 Sail Power, XR Mag Viking 10, Sea Pro Marathon 10, 15, and Sea Pro Marathon 15, with serial number 0A197112 and up. These engines, available in 6, 8, 9.9, 10, and 15 horsepower configurations, are known for their robust engineering and reliability, making them a popular choice for various marine applications. This manual provides comprehensive guidance to ensure these dependable engines continue to perform optimally. The purpose of this manual is to provide detailed information for the maintenance, repair, and servicing of your Mercury Mariner outboard engine. It includes step-by-step instructions, detailed illustrations, diagrams, and pictures covering all major systems, such as the powerhead, fuel delivery, ignition, charging, starting, transmission, cooling, and controls. Troubleshooting procedures, wiring diagrams, and installation guidance are also included. This resource is designed for both DIY enthusiasts and experienced mechanics, offering an inexpensive way to keep your engine in peak working condition.