This service repair manual covers Mercury Mariner Outboard models, including the 40/45/50/50 Bigfoot variants. These 4-stroke outboard motors are designed for reliable performance and are engineered with quality components. While specific production years are not explicitly stated, the manual is applicable to a range of serial numbers, indicating its comprehensive coverage for these Mercury Mariner Outboard models. This manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Mercury Mariner Outboard. It includes procedures for lubrication, electrical systems such as ignition, charging, and starting, as well as fuel system components and engine assemblies. Coverage extends to the gear housing, trim and tilt systems, and controls, along with wiring diagrams and general specifications. This resource is designed to assist owners and technicians in ensuring the optimal performance and longevity of the outboard motor.