This manual covers the Mercury Mariner 25 outboard motor, including variants such as the Marathon 25 and SeaPro 25. Designed as a reliable and efficient water-cooled, 2-stroke gasoline engine, it delivers 25 horsepower with a displacement of approximately 25 cubic inches. Its robust engineering ensures dependable performance for various marine applications. This comprehensive Factory Service Repair Manual, provided in English, offers detailed guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner 25 outboard motor. It includes essential information on lubrication with 2-stroke outboard oil, electrical system specifics, and propulsion system details. This manual is an indispensable resource for owners and technicians aiming to preserve the optimal performance and longevity of the engine.