This manual covers the Yamaha 25J, 30D, 25X, and 30X Outboard models. These engines are known for their reliable performance and robust engineering, designed to meet the demands of various marine applications. The comprehensive information within this document will assist in understanding and maintaining these powerful outboard units, ensuring their longevity and optimal function on the water. The purpose of this Service Repair Workshop Manual is to provide detailed guidance for owners, mechanics, and technicians. It encompasses essential information on maintenance procedures, engine service for various components including the fuel and power units, troubleshooting diagnostics, and technical specifications. With clear diagrams and instructions, this manual is an indispensable resource for performing necessary upkeep and repairs, enabling users to maintain their Yamaha outboards effectively.