This manual covers the Mercury Mariner outboard motor, a gasoline-powered, water-cooled engine designed for marine propulsion. Featuring a 25 HP output and an aluminum alloy powerhead, this outboard motor is engineered for reliability and performance on the water. It utilizes a carburetor for fuel delivery and a CDI ignition system for efficient operation. The drive type is an outboard drive with a 13-spline propeller shaft, and steering and throttle control can be managed via a tiller handle or remote system. Emissions compliance with EPA and CARB standards is a key consideration for this model. The purpose of this Factory Service Repair Manual is to provide comprehensive guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard motor. Within its hundreds of pages, you will find detailed technical specifications, step-by-step procedures for lubrication and cooling system maintenance, and information on electrical and fuel system components. This manual is an essential resource for owners, mechanics, and technicians seeking to ensure the optimal performance, longevity, and safety of their 25 HP Mercury Mariner outboard motor.