This factory service manual covers the Yamaha 40C and 50C two-stroke outboard motors manufactured between 2004 and 2009. These marine propulsion units are engineered by Yamaha Motor Corporation for reliable performance in demanding aquatic environments. Designed for gasoline fuel and utilizing an outboard drive system with forward, neutral, and reverse gears, these engines deliver dependable power for a variety of marine applications.

This comprehensive manual provides essential information for the maintenance, repair, and technical understanding of your Yamaha outboard motor. It details recommended service procedures, including oil specifications, and offers guidance on troubleshooting and technical specifications. Owners, mechanics, and technicians will find this resource invaluable for ensuring optimal performance, longevity, and safe operation of the 40C and 50C models.