This workshop service repair manual covers the Yamaha Outboard 60C, 70C, and 90C Series models manufactured from 2003 onwards. These gasoline-powered, water-cooled outboard motors are engineered for reliability and performance, offering power outputs of 60 HP, 70 HP, and 90 HP respectively. The manual details various engine configurations, including likely in-line 3-cylinder and potentially 4-cylinder designs for the higher horsepower models, along with their associated displacements and ignition systems. This comprehensive English-language manual provides essential information for the maintenance and repair of your Yamaha outboard motor. It covers a wide range of topics including mechanical and electrical repairs, troubleshooting, lubrication procedures, tuning, fuel and ignition systems, power head and gearcase servicing, tilt and trim operations, wiring diagrams, oil injection systems, starters, and engine synchronization. With detailed pictures and diagrams, this resource is designed to assist owners, mechanics, and technicians in keeping their engines in optimal working condition.