This Service Repair Manual covers the Yamaha F100B and F100C outboard motors, designed for reliable marine propulsion. These motors represent Yamaha's commitment to engineering excellence, providing robust performance for a variety of boating applications. With a focus on durability and efficiency, the F100 series offers dependable power for recreational and professional use, ensuring a superior experience on the water. This comprehensive manual is your essential guide for maintaining and repairing your Yamaha outboard motor. It provides detailed information across numerous sections, including general information, specifications, periodic checks, fuel system, power unit, lower unit, bracket unit, electrical systems, and troubleshooting. Featuring step-by-step instructions with accompanying pictures, this manual is tailored for both do-it-yourself enthusiasts and experienced mechanics, ensuring optimal performance and longevity of your F100B or F100C motor.