This Service & Repair Manual covers Yamaha Outboard Motors, specifically models 25BMH, 25BW, 25BWC, 30HMH, 30HW, 30HWC, 30HWH, and E25BMH, designed for marine propulsion. These engines, offering 25 HP and 30 HP options, are engineered for reliability and performance on the water. This manual provides comprehensive documentation to ensure optimal operation and longevity of your Yamaha outboard motor. The purpose of this manual is to provide detailed information for the maintenance, servicing, and repair of your Yamaha outboard motor. It includes complete tear-down and rebuild procedures, troubleshooting guides, periodic checks and adjustments, and in-depth coverage of the fuel system, power unit, lower unit, bracket unit, and electrical system. With included pictures, part diagrams, electrical and hydraulic diagrams, and real photo illustrations, this 538-page English manual is an essential resource for owners, mechanics, and technicians.