This service manual covers Yamaha Outboard Motors, specifically models 50G, 60F, 70B, 75C, and 90A. These engines are engineered for reliability and performance, featuring 3-cylinder configurations and water-cooled systems. The 50G and 60F models offer 50 and 60 horsepower respectively from a 742 cc displacement, while the 70B, 75C, and 90A models provide 70, 75, and 90 horsepower from an 849 cc displacement. These outboard motors are designed for a variety of marine applications, delivering consistent power and efficient operation.

This manual provides comprehensive guidance for the maintenance and repair of your Yamaha Outboard Motors. It details essential procedures, including lubrication with recommended Yamaha Outboard Gear Oil and scheduled maintenance intervals based on operating hours or time. Technical specifications, troubleshooting information, and details on the CDI ignition system and fuel injection are also included. This resource is designed to assist owners, mechanics, and technicians in keeping these engines in optimal condition, ensuring longevity and peak performance.