This workshop service repair manual covers the Mercury Mariner outboard engine, specifically the 25 horsepower models, including the Marathon 25 and SeaPro 25 variants. Engineered for reliability and performance, these engines are designed to meet the demands of various marine applications. Their robust construction and efficient power delivery make them a dependable choice for boaters seeking consistent operation and durability on the water. This comprehensive English-language manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It details all aspects of the engine, including its mechanical specifications, operational procedures, and recommended service intervals. By following the guidelines within this manual, owners and technicians can ensure optimal performance, longevity, and safety of the vessel's propulsion system.