This manual covers the Mercury Mariner 45 Jet Outboards, specifically models with Serial Number 0D000750 and above. These 2-stroke, water-cooled outboard motors feature a 736cc displacement, delivering 45 horsepower through a carbureted fuel system and CDI ignition. Designed for marine propulsion, they utilize a jet drive system with a stainless steel impeller for efficient performance, operating within a wide-open throttle range of 5000-5500 RPM. The engineering focuses on reliability and robust performance for various watercraft applications. This comprehensive Service Repair Manual provides essential information for maintaining and repairing your Mercury Mariner 45 Jet Outboard. It details critical maintenance procedures, including specific lubrication requirements for the gearcase using Quicksilver High-Performance Gear Lubricant and the recommended 50:1 fuel-to-oil ratio. Technical specifications, troubleshooting guidance, and safety instructions are included to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the engine.