This comprehensive service repair manual provides detailed instructions and guidance for maintaining, servicing, diagnosing, and repairing your Mercury Mariner Outboard 25 Bigfoot (4-Stroke) engine, covering models starting from 1998 with serial numbers 0G590000 and newer. This manual is the same type of resource used by professional mechanics and dealers, offering step-by-step instructions and highly detailed exploded diagrams to ensure you complete each task correctly and efficiently. The manual is organized into sections covering all aspects of your outboard motor. Section 1 begins with vital information including specifications, maintenance schedules, general information, and outboard motor installation procedures. Section 2 dives into the electrical system, covering ignition, charging and starting systems, timing, synchronizing, adjusting, and wiring diagrams. Section 3 focuses on the fuel system, detailing fuel pump, carburetor, and emission system components. Section 4 delves into the heart of the engine, the powerhead, with detailed instructions on cylinder head, cylinder block/crankcase, and lubrication systems. Section 5 covers the mid-section, including clamp/swivel brackets, drive shaft housing, power trim, and gas assist manual tilt mechanisms. Section 6 provides a thorough guide to the lower unit, the engine's underwater propulsion system. Section 7 outlines attachments and control linkage, focusing on throttle/shift linkage and tiller handle operations. Section 8 offers step-by-step instructions for the manual starter system, while Section 9 provides clear and comprehensive color diagrams to further assist in your understanding and repair process. This manual is a valuable tool for any Mercury Mariner 25 Bigfoot (4-Stroke) owner seeking to perform routine maintenance, address minor issues, or undertake more complex repairs.

The Mercury Mariner 25 Bigfoot (4-stroke) outboard motor, introduced in 1998 and continuing production thereafter, is a popular choice for small to medium-sized boats. The 25 Bigfoot is known for its reliable performance, fuel efficiency, and user-friendly design, making it ideal for fishing, cruising, or simply enjoying time on the water. This engine boasts a 25-horsepower output, achieved through a compact, four-stroke engine design. The "Bigfoot" moniker refers to the engine's extended shaft length, which offers greater versatility when mounting on different boat types. The 25 Bigfoot's ease of use extends beyond its simple operation to encompass its maintenance and repair. With its comprehensive service repair manual, owners are equipped with detailed instructions and diagrams to perform a wide range of procedures. This includes everything from routine maintenance like oil changes and spark plug replacement to more complex tasks like carburetor adjustments and engine rebuilds. The manual covers all aspects of the engine, from the electrical system and fuel system to the powerhead, mid-section, and lower unit. It also includes detailed wiring diagrams and color diagrams for assisting in troubleshooting and repair. Accessing this digital manual eliminates the need for physical copies, allowing for instant download and a convenient resource for any owner seeking to maintain their Mercury Mariner 25 Bigfoot outboard engine.