This manual covers the Yamaha F100B and F100C Outboard models, renowned for their four-stroke, water-cooled engine design and 100 HP output. These engines feature a Capacitor Discharge Ignition (CDI) system and fuel injection, ensuring efficient and reliable performance. The transmission provides Forward, Neutral, and Reverse gear selection. This service repair workshop manual is designed for these robust outboard motors, which are built for demanding marine applications. This comprehensive English-language service manual provides detailed information essential for the maintenance and repair of your Yamaha F100B/F100C Outboard. It includes extensive coverage of general information, technical specifications, and service procedures for the power unit, lower unit, bracket unit, and electrical systems. With hundreds of photos and illustrations, along with a troubleshooting guide, this manual is an indispensable resource for owners and technicians seeking to maintain the optimal performance and longevity of their outboard engine.