This Service Repair Manual covers Yamaha 50G, 60F, 70B, 75C, and 90A outboard engines. These engines are engineered for reliable performance, offering horsepower options ranging from 50 HP to 90 HP. Designed for a wide array of marine applications, they represent a commitment to quality and durability in outboard motor technology. This manual provides comprehensive documentation to ensure these engines operate at their peak efficiency. The purpose of this English-language Service Repair Manual is to provide detailed guidance for the maintenance and repair of the specified Yamaha outboard engines. It covers a broad spectrum of topics, including general information, specifications, periodic checks and adjustments, fuel system, power unit, lower unit, bracket unit, electrical system, and troubleshooting. With hundreds of photos and illustrations, and step-by-step instructions derived from complete disassembly, this manual is an invaluable resource for do-it-yourself owners and experienced mechanics alike, helping to keep the vehicle working properly and save money on repairs.