This workshop service repair manual covers the Mercury Mariner 125 HP Outboard engine. Designed for reliability and performance, this outboard engine is engineered to provide consistent power and efficiency for a wide range of marine applications. Its robust construction and advanced design ensure dependable operation in demanding conditions, making it a preferred choice for boaters seeking a powerful and trustworthy propulsion system. This comprehensive manual provides detailed instructions and technical information essential for the maintenance and repair of your Mercury Mariner 125 HP Outboard. It includes step-by-step procedures for all major components, such as the powerhead, fuel system, electrical systems, and lower unit. With hundreds of illustrations, detailed substeps, and critical information alerts, this guide is an invaluable resource for both do-it-yourself enthusiasts and professional mechanics aiming to keep their engine in optimal working condition.