This Service Repair Workshop Manual covers the Mercury Mariner 90 HP outboard engine. Designed for marine applications, this engine delivers robust performance and reliability, making it a dependable choice for various boating needs. Its engineering focuses on efficiency and durability, ensuring consistent operation across different conditions. The 90 HP rating signifies a capable power output suitable for a range of vessel sizes and water activities. This manual provides comprehensive guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner 90 HP outboard. It details essential procedures, technical specifications, and diagnostic information necessary for optimal performance and longevity. Owners, technicians, and mechanics will find the information within this guide invaluable for understanding the engine's systems, performing routine servicing, and addressing any operational issues.