This workshop service repair manual covers Yamaha outboard models 50G, 60F, 70B, 75C, and 90A, encompassing all engine, power unit, and transmission types. These engines are engineered for reliability and performance, making them a trusted choice for various marine applications. This comprehensive manual ensures you have the necessary information to maintain and operate your Yamaha outboard with confidence. The purpose of this manual is to provide detailed guidance for the maintenance, diagnosis, and repair of your Yamaha outboard. It includes step-by-step procedures, diagnostic information for all major systems, electrical system diagrams, and troubleshooting guides. By following the instructions and utilizing the technical specifications and insights contained within, owners and technicians can perform periodic checks, adjustments, and repairs effectively, leading to significant cost savings and ensuring the longevity of the equipment.