This manual covers the Yamaha 2 SD Outboard, a 1990 model year water-cooled, 2-stroke engine. Designed for reliable performance on the water, this outboard motor is engineered with robust components and a straightforward operational design. Its water-cooled system ensures efficient operation under various conditions, and the Forward-Neutral-Reverse gearcase provides versatile control. The CDI ignition system contributes to dependable starting and smooth running, making it a practical choice for a range of boating applications. This comprehensive Service Repair Maintenance manual in English provides essential information for maintaining and repairing your Yamaha 2 SD Outboard. It details step-by-step procedures, includes exploded diagrams for clarity, and is designed to be searchable and bookmarked for easy navigation. Owners, mechanics, and technicians will find guidance on recommended fluids, fuel mixture, spark plug types, and troubleshooting. The manual aims to empower users with the knowledge necessary to keep their outboard in optimal working condition, ensuring longevity and peak performance.