This service repair manual covers Yamaha F20A, F25A, and F25X outboard models. These 4-stroke, water-cooled engines are designed for reliable performance, offering power outputs of approximately 20 HP and 25 HP. The manual addresses various configurations, including different shaft lengths (S, L, X) and electrical start systems, catering to a wide range of operational needs. This comprehensive manual provides detailed, step-by-step repair instructions and high-quality diagrams to assist owners and technicians. It covers essential maintenance procedures, lubrication specifications, troubleshooting analysis, and electrical system wiring diagrams for specific model variants. The objective is to empower users to effectively maintain and repair their Yamaha outboard engines.