This manual covers Yamaha 25HP Outboard engines produced between 1991 and 2002. These 2-stroke engines are available in 2-cylinder and 3-cylinder configurations, delivering reliable performance for a variety of marine applications. The engineering quality inherent in Yamaha outboards ensures durability and efficiency, making them a trusted choice for boaters. This service repair manual provides comprehensive information for these specific models. The purpose of this English-language service repair manual is to guide owners, technicians, and mechanics through the maintenance and repair of Yamaha 25HP Outboard engines. It includes detailed, step-by-step repair instructions, accompanied by pictures and diagrams, covering major repair areas such as the ignition and electrical systems, fuel system, starting system, powerhead, mid unit, and lower unit. Furthermore, the manual offers an advanced troubleshooting guide and covers periodic maintenance, tune-ups, and adjustments, enabling users to perform tasks from simple upkeep to complete engine overhauls.