The Mercury Mariner Outboard 25 Bigfoot (4-Stroke) Service & Repair Manual, covering the 1998 model year, offers comprehensive guidance for maintaining, repairing, and rebuilding your outboard motor. This manual is a valuable resource for both experienced mechanics and DIY enthusiasts. The manual meticulously covers every aspect of your outboard motor, from complete tear down and rebuild procedures to detailed illustrations, exploded diagrams, drawings, and photos for each service and repair procedure. You'll find precise torque specifications, troubleshooting tips, and detailed wiring schematics, ensuring you have everything you need to perform any repair or maintenance task. The manual is organized into distinct sections: * **Section 1 - Important Information:** This section covers vital specifications, essential maintenance procedures, general information about your outboard motor, and instructions for installing the motor. * **Section 2 - Electrical:** This section guides you through the ignition system, charging and starting systems, timing, synchronization, adjustment procedures, and detailed wiring diagrams. * **Section 3 - Fuel System:** This section provides comprehensive information about the fuel pump, carburetor, and emissions system. * **Section 4 - Powerhead:** This section focuses on the cylinder head, cylinder block/crankcase, and lubrication system. * **Section 5 - Mid-Section:** This section delves into the clamp/swivel brackets, drive shaft housing, power trim system, and gas-assist manual tilt system. * **Section 6 - Lower Unit:** This section provides in-depth instructions for servicing and repairing the lower unit. * **Section 7 - Attachments/Control Linkage:** This section covers the throttle/shift linkage and tiller handle. * **Section 8 - Manual Starter:** This section provides detailed instructions for the manual starter. * **Section 9 - Color Diagrams:** This section includes color diagrams for visual reference. With the Mercury Mariner Outboard 25 Bigfoot (4-Stroke) Service & Repair Manual, you'll have all the information you need to keep your outboard motor running smoothly and efficiently.

The Mercury Mariner 25 Bigfoot 4-stroke outboard motor, produced in 1998, is a reliable and compact powerplant designed for smaller boats. It boasts a single-cylinder, four-stroke engine with a displacement of 604cc, delivering a maximum output of 25 horsepower. This model was part of Mercury's commitment to enhancing the boating experience with fuel-efficient and environmentally conscious options. Notably, the "Bigfoot" designation signifies a longer shaft length, making it suitable for boats with deeper hulls or those operating in shallow waters. Despite its relatively modest power output, the 25 Bigfoot boasts several features that contribute to its appeal. The 4-stroke design ensures smoother and quieter operation compared to its 2-stroke counterparts, reducing noise and emissions. Its lightweight construction and compact size make it easy to handle and install. This outboard motor also incorporates a simple and robust design, making maintenance and repairs relatively straightforward. Although it may not be the most powerful outboard on the market, the Mercury Mariner 25 Bigfoot 4-stroke remains a popular choice for anglers, recreational boaters, and those seeking a reliable and efficient engine for their smaller vessels.