This manual covers the Yamaha F80TLRX, a 4-stroke outboard engine from its first generation, produced in 1999. Engineered for reliability and performance, this 80 HP (59.6 kW) motor features a 4-cylinder configuration with a displacement of 1475 cc (90.1 ci). Its Multi-point Fuel Injection (MPI) system ensures efficient fuel delivery, while the water-cooled design maintains optimal operating temperatures. With a robust outboard lower unit and power trim and tilt capabilities, the F80TLRX is designed for demanding marine applications. This comprehensive Service Repair Maintenance Manual in English provides essential information for owners, mechanics, and technicians. It details maintenance procedures, troubleshooting guidance, technical specifications, and safety protocols necessary for the upkeep of your Yamaha F80TLRX. Coverage includes engine configuration, performance data, fuel and cooling systems, transmission details, electrical components, and control systems. By following the instructions within this manual, users can ensure the longevity and optimal performance of their marine engine.