This manual covers the Yamaha F100 TXRX outboard motor, manufactured by Yamaha Motor Corporation for the 1999 model year. Designed for marine propulsion, this 4-stroke, 100 horsepower engine utilizes fuel injection and a CDI ignition system for efficient operation. Its water-cooled design and outboard drive system, featuring a 13:23 gear ratio, are engineered for reliability and performance on the water. The motor typically employs a 3-blade propeller and features an electric start system, complemented by a 17-amp alternator. This Factory Service Manual, written in English, provides comprehensive guidance for the maintenance, repair, and servicing of your Yamaha F100 TXRX outboard motor. It details disassembly, repair, assembly, and inspection operations, offering step-by-step procedures and exploded diagrams to facilitate understanding. The manual covers essential areas such as recommended maintenance, including the use of Yamalube 4M Outboard Motor Oil, and technical specifications. Its searchable format with bookmarked content ensures that owners, mechanics, and technicians can efficiently access the information needed to keep the motor in optimal working condition.