This workshop repair manual covers the Mercury Mariner Outboard Bigfoot 4-stroke 45 HP motor. Engineered for reliability and performance, this outboard motor is designed for a variety of marine applications. The Bigfoot model signifies enhanced torque and durability, making it suitable for demanding tasks. This manual is specifically intended for the repair and maintenance of these robust 4-stroke engines. The purpose of this manual is to provide comprehensive guidance for maintaining and repairing your Mercury Mariner Outboard. It details recommended repair and maintenance procedures, offers troubleshooting assistance for diagnosing problems, and includes essential technical specifications. Coverage spans all major components, from the fuel and electrical systems to the powerhead, mid-section, and gear housing. This resource is invaluable for mechanics, beginner mechanics, and vehicle owners seeking to ensure their outboard motor operates at peak performance.