This workshop service repair manual covers Yamaha outboard engines, models 60C, 70C, and 90C, from 2003 onwards. These engines are engineered for reliable performance and are designed for a variety of marine applications. This manual provides comprehensive information to ensure the continued optimal operation and longevity of your Yamaha outboard. The purpose of this English-language manual is to serve as a complete guide for maintenance, repair, and troubleshooting. It includes detailed repair procedures, specifications, adjustment instructions, and disassembly/assembly guidance, all supported by included illustrations, diagrams, and pictures. This resource is essential for owners, technicians, and mechanics seeking to perform all necessary servicing and repairs efficiently and accurately.