This Service Repair Workshop Manual provides comprehensive information for the Tohatsu MFS 25B/30B 4-Stroke outboard engines. These engines are engineered for reliability and performance, featuring a 430 cc displacement and advanced Multi-point Electronic Fuel Injection (EFI) for efficient operation. With power outputs of 25 hp (18.4 kW) and 30 hp (22.1 kW) respectively, and equipped with a CDI ignition system and electric start, the MFS 25B/30B series is designed to meet a variety of marine propulsion needs. Their water-cooled design and typical 12V, 27A alternator output ensure consistent performance in demanding conditions. The purpose of this manual is to serve as an authoritative guide for maintaining and repairing your Tohatsu MFS 25B/30B engine. It covers essential areas including detailed service information, critical service data, routine maintenance schedules, and specific procedures for the fuel system, power unit, lower unit, and electrical system. The manual also includes a dedicated troubleshooting section to help diagnose and resolve common issues, along with wiring diagrams and information on accessories. By following the instructions and specifications outlined herein, owners and technicians can ensure the longevity, optimal performance, and safe operation of their Tohatsu outboard engines.