This Service Repair Workshop Manual covers Mercury outboard motors, specifically the 15hp, 20hp, and 25hp models manufactured between 2005 and 2011. These engines are part of the 2-cylinder, 4-stroke era, designed for reliable performance on the water. The manual provides comprehensive information for these carbureted, water-cooled engines with CDI ignition systems, ensuring owners and technicians have the resources needed to maintain and operate them effectively. This manual offers in-depth guidance for all aspects of engine care, including detailed step-by-step instructions, troubleshooting procedures, and technical specifications. It covers routine maintenance, such as lubrication and scheduled service intervals, as well as more complex repair tasks. With hundreds of pages featuring detailed photos, diagrams, and exploded views, this English-language manual is an essential resource for anyone needing to service or repair these Mercury outboard models.