This manual covers the Yamaha 9.9 HP Outboard motor, produced between 1984 and 1992. These reliable 2-stroke engines, featuring a 2-cylinder configuration and 123 cc displacement, deliver 9.9 HP at 5000 RPM. Engineered for consistent performance, the water-cooled motor utilizes a CDI ignition system and carburetor for efficient operation, making it a dependable choice for various marine applications. This comprehensive Service Repair Workshop Manual provides essential information for maintaining and repairing your Yamaha 9.9 HP Outboard. It details critical procedures, technical specifications, and troubleshooting guidance. Owners, mechanics, and technicians will find valuable insights into lubrication, ignition, carburetor settings, cooling system maintenance, and more, ensuring optimal performance and longevity of the outboard motor.