This service manual covers the Mercury 250 Optimax Jet Drive, manufactured in 2002. This powerful 250 horsepower, 3.0L direct injection two-stroke engine is water-cooled and features a jet drive propulsion system. Renowned for its engineering quality and reliability, the Optimax series offers advanced direct fuel injection technology for optimal performance. This manual is designed to provide comprehensive information for owners and technicians working with this specific model, starting from serial number 0E407100. The purpose of this manual is to serve as a complete guide for the maintenance, repair, and troubleshooting of your Mercury 250 Optimax Jet Drive. It includes detailed procedures, technical specifications, safety guidelines, and diagnostic information. With clear, step-by-step instructions, zoomable illustrations, and exploded views, this document empowers you to perform necessary upkeep and resolve issues efficiently. Regular adherence to the maintenance schedule and recommended procedures outlined herein will ensure the longevity and optimal performance of your engine.