This workshop service repair manual covers Yamaha 60C, 70C, and 90C Series Outboard engines. These engines are designed for marine applications and offer reliable performance with horsepower ratings of 60, 70, and 90 PS. While specific production years are not detailed, the manual is intended for a range of models within these series, likely featuring 2-stroke engine technology and carburetor induction. The engineering quality of Yamaha outboards is renowned, and these models are built to provide dependable operation for various boating needs. This comprehensive English-language manual provides essential information for the maintenance, repair, and troubleshooting of your Yamaha outboard. It includes detailed sections on general information, technical specifications, periodic checks and adjustments, fuel system, power unit, lower unit, bracket unit, and the electrical system. Furthermore, it offers guidance on trouble analysis, ensuring that owners, mechanics, and technicians have the necessary resources to keep these engines running optimally.