This manual covers the Yamaha 25BMH and 30HMH outboard motors manufactured in 2020. These 2-stroke outboard engines, with a displacement of 498cc, are designed for reliable performance on the water. The 25HP model delivers 25 HP (18.6 kW) at 5000 RPM, while the 30HP model provides 30 HP (22.1 kW) at 5000 RPM. Engineered with a CDI magneto ignition system and water cooling, these motors are built for durability and efficiency. This Service Repair Workshop Manual provides comprehensive guidance for maintaining and repairing your Yamaha outboard. It details general information, specifications, periodic checks and adjustments, and in-depth procedures for the fuel system, power unit, lower unit, bracket unit, and electrical system. Troubleshooting guides and a wiring diagram are included to assist with diagnosing and resolving issues, ensuring your motor operates at peak performance.