This manual covers Yamaha outboard motors from 50 HP to 90 HP, specifically the 50G, 60F, 70B, 75C, and 90A models. These engines are known for their robust engineering and reliable performance, designed for a variety of marine applications. Featuring inline, 3-cylinder configurations, these water-cooled outboards utilize advanced ignition and starting systems, with fuel induction varying by specific model code. The manual provides comprehensive information to ensure these engines operate at their peak efficiency and longevity. This comprehensive service repair manual offers detailed guidance for owners, mechanics, and technicians. It encompasses all essential aspects of maintenance and repair, including detailed specifications, troubleshooting procedures, scheduled maintenance recommendations, and step-by-step instructions for overhauling various engine systems. Covered areas include the power head, fuel system, electrical and ignition systems, cooling system, mid-section, and lower unit. With clear illustrations and diagrams, this manual is an indispensable resource for maintaining and repairing your Yamaha outboard motor.