This manual covers the Yamaha 60C, 70C, and 90C marine outboard motors manufactured between 2003 and 2006. These outboard motors are engineered for reliability and performance, offering robust solutions for marine propulsion. Their design emphasizes durability and efficient operation, making them a trusted choice for a variety of boating applications where dependable power is essential. This comprehensive service repair manual is designed to assist owners and technicians in maintaining and repairing these Yamaha outboard motors. It provides detailed information on general information, specifications, periodic inspection and adjustment, fuel system, power unit, lower unit, bracket unit, electrical system, and troubleshooting. By following the procedures outlined within, users can effectively fix problems, maintain optimal functioning, and prevent future issues, ensuring the longevity and performance of the marine outboard motor.