Your complete guide to keeping your Mercury outboard running strong. This Seloc manual covers 1965–1989 Mercury engines from 90–300 HP, including fuel-injected models and MR drives. Get step-by-step instructions with hundreds of photos and diagrams for everything from routine maintenance to full engine overhauls. Includes maintenance schedules, troubleshooting tips, wiring diagrams, and a skill-rating system so you know what jobs you can tackle yourself. Trusted by boat owners and technical schools for over 50 years.