This Service Repair Manual covers the Yamaha F100CET outboard motor, a 4-stroke marine propulsion unit designed for reliable performance. Engineered for demanding marine environments, this motor delivers 100 horsepower using unleaded gasoline, offering robust power and efficiency for a wide range of boating applications. Yamaha's commitment to quality ensures dependable operation, making the F100CET a trusted choice for recreational and professional use. This manual provides comprehensive guidance for the maintenance and repair of your Yamaha F100CET outboard motor. It includes detailed step-by-step instructions, complete disassembly procedures, troubleshooting diagnostics, and essential technical specifications. Whether you are performing routine maintenance or complex repairs, this resource is designed to assist owners, mechanics, and technicians in keeping the engine in optimal condition and ensuring its longevity.