This manual covers Yamaha 25BMH and 30HMH outboard motors manufactured between 1983 and 2006. These 2-stroke gasoline-powered outboard motors are engineered for reliability and performance, delivering 25hp and 30hp respectively. Designed for a wide range of marine applications, these engines are built to provide dependable power for various boating needs. This comprehensive repair service and technical maintenance manual provides detailed information for owners, mechanics, and technicians. It includes step-by-step instructions, exploded views, and essential data for performing repairs, maintenance, and service. Key areas covered include general information, specifications, periodic inspections and adjustments, fuel system, power unit, lower unit, bracket unit, electrical systems, and troubleshooting. The manual is presented in English, French, Spanish, and German.