This comprehensive service manual covers Yamaha Outboard models 50G, 60F, 70B, 75C, and 90A. These robust outboard motors are engineered for reliability and performance, suitable for a wide range of marine applications. Yamaha's commitment to quality is evident in the advanced design and durable construction of these engines, ensuring efficient operation and longevity on the water. This manual provides all necessary information to understand, maintain, and repair these specific Yamaha Outboard units. The purpose of this manual is to serve as a complete guide for all maintenance, troubleshooting, and repair procedures. It contains detailed instructions, technical data, diagrams, parts lists, and wiring schematics essential for accurate diagnosis and effective service. Whether you are a novice owner or an experienced technician, this resource offers the in-depth knowledge required to keep your Yamaha Outboard running optimally, covering every aspect from routine preventative maintenance to complex repairs.