This workshop service repair manual covers the Mercury Mariner 75 HP and 90 HP 4-stroke outboard motors manufactured between 2000 and 2005. These engines, part of the first generation, are engineered for reliable performance, featuring a 1598 cc displacement and Multi-port Electronic Fuel Injection (MPI) for efficient power delivery. The 75 HP model delivers its power at 5000 RPM, while the 90 HP model reaches maximum power at 5500 RPM. With a robust water-cooled system and SmartCraft Digital Ignition, these engines are designed for demanding marine applications. This comprehensive manual provides detailed information essential for the maintenance and repair of your Mercury Mariner outboard. It includes step-by-step procedures for routine maintenance, such as recommended oil types and capacities, spark plug specifications, and gear lube requirements. Furthermore, the manual covers critical aspects of engine operation, troubleshooting common issues, and technical specifications, including alternator output and gear reduction ratios. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the longevity and optimal performance of their 2000-2005 Mercury Mariner 75 HP and 90 HP engines.