This workshop service repair manual covers the Mercury Mariner 40/50/60 4-Stroke EFI Outboard motors manufactured in 2002 and above, with serial numbers 1C050252 and above. These gasoline-powered outboard motors feature Electronic Fuel Injection (EFI) technology and are available in 40, 50, and 60 horsepower models. Engineered for reliability and performance, these Mercury Mariner outboards are designed to provide dependable power for a variety of marine applications. This comprehensive manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard motor. It includes in-depth sections on general information, installation, electrical systems, ignition, charging and starting, timing, EFI theory of operation, and diagnostics. Furthermore, it covers extensive service procedures for the powerhead, mid-section, and lower unit, including specific guidance for Bigfoot gear housings and various attachments and control linkages. This resource is intended for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their outboard motor.