The Mercury Mariner 40 45 50 Bigfoot Outboard Service Manual is a comprehensive guide for servicing, repairing, and maintaining your Mercury Mariner 40, 45, and 50 Bigfoot outboard motors. This manual provides detailed step-by-step instructions, clear illustrations, and troubleshooting tips, making it an invaluable resource for both professional technicians and DIY enthusiasts. It covers all aspects of your outboard motor, from general information and specifications to in-depth repair procedures.

This manual covers the following model years: 1998 and later. It includes models with starting serial numbers: United States: 0G231123.

The manual comprehensively covers all aspects of your outboard motor, including:

- Specifications
- Maintenance
- General Information
- Outboard Motor Installation
- Electrical
- Ignition
- Charging & Starting System
- Timing
- Synchronizing & Adjusting
- Wiring Diagrams
- Fuel System
- Fuel Pump
- Carburetor
- Emissions
- Powerhead
- Cylinder Head
- Cylinder Block/Crankcase
- Lubrication
- Mid-Section
- Clamp/Swivel Brackets & Drive Shaft Housing
- Power Trim (1998 also Earlier Non-Bigfoot)
- Power Trim (1999 also Later Non-Bigfoot/All Big-Foot Model Years)
- Manual Tilt Assist
- Gear Housing Non-Bigfoot
- Gear Housing Bigfoot
- Attachments/Control Linkage
- Throttle/Shift Linkage
- Tiller Handle

This manual is designed to be your essential guide for all your repair and troubleshooting needs. With its detailed explanations and clear illustrations, you'll have everything you need to perform repairs and maintenance with confidence. Whether you're a seasoned mechanic or a weekend warrior, this manual will empower you to keep your Mercury Mariner outboard running smoothly.

The Mercury Mariner 40, 45, and 50 Bigfoot outboard motors were designed to deliver robust performance and reliability for a wide range of boating applications. These models, which were produced from the late 1990s to the mid-2000s, were known for their powerful, yet fuel-efficient two-stroke engines, boasting displacement options ranging from 40 to 50 cubic inches. The "Bigfoot" designation refers to the motor's extended, low-profile transom bracket, which allowed for improved handling, reduced cavitation, and greater stability, especially when operating at low speeds. These motors were favored by anglers, recreational boaters, and commercial users alike, serving as reliable workhorses for fishing, cruising, and light-duty transport.

The Mercury Mariner 40, 45, and 50 Bigfoot outboards featured a number of innovative features and design elements that contributed to their popularity. They incorporated a durable and corrosion-resistant aluminum construction, along with a compact and lightweight design, simplifying installation and handling. These motors were also equipped with a reliable CDI ignition system, ensuring consistent performance and ease of starting. The integrated tilt and trim system enabled users to adjust the engine angle for optimal performance, while the multi-position steering bracket facilitated customized boat control. The Mercury Mariner 40, 45, and 50 Bigfoot outboards were renowned for their durability and serviceability, making them excellent investments for users seeking reliable and dependable marine propulsion.