This manual covers the 1997 Yamaha 60HP, 70HP, 75HP, and 90HP outboard motors. These 2-stroke, gasoline-powered engines are designed for boat propulsion, embodying Yamaha's commitment to engineering quality and reliability. Each model in this series offers robust performance for a variety of boating applications, ensuring dependable operation on the water. This comprehensive English-language manual serves as both an owner's guide and a detailed repair resource. It encompasses general information, routine maintenance procedures, engine specifications, and advanced troubleshooting for the fuel, lubrication, cooling, transmission, steering, and electrical systems. It also includes sections on engine removal and installation, body work, and intake/exhaust, providing essential knowledge for owners, mechanics, and technicians to maintain and repair these outboard motors effectively.