This manual covers the Yamaha 2SD, a first-generation model from 1990. Designed as an outboard motor, this unit features a robust 2-stroke engine, likely a single cylinder, producing approximately 2 horsepower. Its engineering prioritizes reliability and efficient operation, making it suitable for a variety of small watercraft applications. The 2SD is equipped with a CDI ignition system, a tiller handle for steering and throttle control via a twist grip, and a 2-blade propeller for propulsion. Maintenance is straightforward, with recommendations for 50:1 fuel-to-oil ratio using 2-stroke outboard oil and water-cooled operation. This comprehensive Service Repair Maintenance Manual in English provides detailed guidance for owners and technicians. It covers all aspects of disassembly, repair, assembly, and inspection, ensuring the longevity and optimal performance of your Yamaha 2SD. The manual includes step-by-step procedures, exploded diagrams, and searchable content to facilitate efficient maintenance and troubleshooting. Key areas addressed include engine specifications, lubrication requirements, fuel system details, cooling system maintenance, and electrical system information, empowering users to perform necessary upkeep and repairs with confidence.