This Service Repair Manual covers Mercury Mariner outboard engines. These engines are known for their robust construction and reliable performance, designed to meet the demands of various marine applications. Featuring fuel-injected systems and electronic ignition, they offer efficient power delivery across a range of horsepower options, including 75, 90, 100, 115, and 125 HP. The water-cooled design and electric start system ensure dependable operation in diverse conditions. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It details critical procedures, technical specifications, and recommended maintenance schedules, including lubrication requirements and fuel system guidelines. By following the instructions within this manual, owners and technicians can ensure the longevity and optimal performance of their Mercury Mariner engine.