This service repair workshop manual covers the Tohatsu MFS C Series 4-stroke outboard engines, specifically models MFS 9.9C, MFS 15C, and MFS 20C. These engines are engineered for reliable performance, offering a horsepower range from 9.9 to 20 HP. The C Series represents a generation of Tohatsu outboards known for their robust construction and efficient operation, making them a dependable choice for various marine applications. This manual provides comprehensive guidance for maintaining and repairing your Tohatsu MFS C Series outboard. It includes detailed information on service data, inspections, adjustments, and specific procedures for the fuel system, power unit, lower unit, bracket, and electrical system. With step-by-step instructions, highly detailed exploded diagrams, and troubleshooting sections, this manual is an essential resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the engine.