This workshop service repair manual covers Yamaha Outboard Motors from the 50G, 60F, 70B, 75C, and 90A series. These 2-stroke, water-cooled engines, featuring 3 cylinders and L-Type engine families, offer reliable performance for various marine applications. With displacements of 849cc and 1141cc, these outboard motors are engineered for durability and efficiency, providing dependable power across their respective horsepower ranges. This comprehensive English-language manual is designed to assist owners, mechanics, and technicians in maintaining and repairing their Yamaha outboard motors. It includes detailed information on general maintenance schedules, lubrication, fluid capacities, and specific repair procedures for engine components, fuel systems, cooling systems, electrical systems, and controls. Furthermore, the manual provides essential technical specifications, including tightening torques, special tool requirements, wiring diagrams, and a diagnostic guide for troubleshooting common issues.