This Service Repair Manual provides comprehensive information for the Yamaha F100B and F100C outboard motors. These 4-stroke, water-cooled engines feature an inline 4-cylinder configuration with a displacement of 1596cc and deliver a rated power of 100 horsepower. Designed for marine applications, these motors are built with Yamaha's renowned engineering for reliability and performance on the water. The manual covers various aspects of these engines, including their robust construction and efficient power delivery. This manual is an essential resource for owners, technicians, and mechanics. It details all necessary procedures for maintaining and repairing the Yamaha F100B and F100C outboard motors. Coverage includes routine maintenance schedules, lubrication requirements, electrical system specifications, fuel system details, and troubleshooting guidance. By following the instructions within this English language manual, users can ensure their engines operate at peak performance and longevity.