This comprehensive service repair workshop manual covers Yamaha, Mercury, and Mariner outboard engines from 1995 to 2004, specifically focusing on 4-stroke models. It encompasses a wide range of horsepower, from 2.5 to 225hp, detailing specific models such as the 2.5, 4, 5, 6, 8, 9.9, 15, 25, 30, 40, 45, 50, 60, 75, 80, 90, 100, 115, 150, 200, and 225hp variants. Designed for reliability and ease of maintenance, these engines are known for their robust engineering, making them a trusted choice for various marine applications. This manual provides extensive guidance for owners and technicians alike. It details essential procedures for maintenance and tune-ups, troubleshooting common issues, and performing in-depth repairs. Key sections include information on tools and techniques, fuel and electrical ignition systems, gear case repair, tilt and trim functions, and starter systems. With detailed pictures, diagrams, and wiring schematics, this 762-page English-language manual is an indispensable resource for ensuring the optimal performance and longevity of your outboard engine.