This manual covers the Mercury Mariner 90 HP 4-stroke outboard engine, manufactured between 2000 and 2005. Designed for reliable performance on the water, these engines are known for their robust engineering and efficient operation. Whether for recreational boating or commercial use, the Mercury Mariner 90 HP offers a dependable power solution. This workshop service repair manual provides comprehensive information to ensure your engine operates at its peak performance and longevity. The purpose of this English-language manual is to guide owners, technicians, and mechanics through the maintenance, troubleshooting, and repair of the Mercury Mariner 90 HP 4-stroke outboard. It details essential service procedures, technical specifications, and diagnostic information necessary for effective upkeep. By following the instructions within this manual, users can perform routine maintenance, address potential issues, and ensure the continued reliability and safety of their Mercury Mariner outboard engine.