This manual covers the Yamaha 40ELRW, 40ESRW, 40MLHW, 40MSHW, and 40TLRW Outboard models from 1998. These 2-stroke, 3-cylinder engines offer 40 horsepower with a displacement of 703cc, featuring a CDI ignition system and water cooling. Designed for reliable performance, these outboards are equipped with three Mikuni carburetors for efficient fuel delivery and a Forward-Neutral-Reverse transmission with a 2.33:1 gear ratio. This comprehensive Service Repair Manual provides essential information for the maintenance, repair, and troubleshooting of your Yamaha outboard. It includes detailed procedures, technical specifications, system diagrams, and safety guidelines. This manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their 1998 Yamaha 40 horsepower outboard engine.