This manual covers the Yamaha 2SK Outboard, a 1985 model designed for marine propulsion. Engineered with a 2-stroke internal combustion engine, this gasoline-powered outboard motor features a water-cooled system and an outboard drive with a gearbox. Yamaha is renowned for its commitment to quality and reliability, ensuring consistent performance for a wide range of boating applications. This Factory Service Manual in English provides comprehensive guidance for maintaining and repairing the Yamaha 2SK Outboard. It details general information, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, and electrical system. Included resources such as wiring diagrams, illustrations, photos, exploded views, step-by-step instructions, and diagnostic procedures empower owners, mechanics, and technicians to ensure the optimal functioning and longevity of this marine propulsion system.