This manual covers the Yamaha F80TXRX outboard motor, produced in 1999. This four-stroke, 80 HP engine features an inline 4-cylinder configuration with a displacement of 77.5 cubic inches (1.27 L). It is equipped with a water-cooled system utilizing an impeller water pump and a CDI ignition system. The transmission offers Forward, Neutral, and Reverse (F-N-R) operation with a gear ratio of 2.33:1. Designed for reliable performance, this outboard motor is engineered to meet the demands of various marine applications. This comprehensive Service Repair Maintenance manual provides detailed instructions for owners, mechanics, and technicians. It includes procedures for complete disassembly, repair, and assembly, supported by exploded diagrams preceding relevant sections. Key areas covered include routine maintenance schedules, recommended lubrication with Yamalube 4M or equivalent SAE 10W-30 oil (5.1 quarts capacity), and specifications for fuel type and octane rating. Adhering to the initial break-in period of 10 hours and regular service intervals of every 100 hours or annually will ensure optimal performance and longevity of your Yamaha F80TXRX outboard motor.