This manual covers the Suzuki DF90, DF100, DF115, and DF140 outboard engines, produced between 2001 and 2009. These first-generation DF Series outboards are characterized by their robust four-stroke, inline 4-cylinder design, featuring advanced electronic fuel injection and electronic ignition systems for reliable performance. With power outputs ranging from 90 to 140 horsepower and displacements of 1502cc or 1840cc depending on the model, these engines are engineered for a wide array of marine applications, offering a blend of power, efficiency, and durability. The inclusion of power trim and tilt further enhances their operational versatility. The purpose of this comprehensive English-language Service and Repair Manual is to provide essential information for the maintenance, repair, and troubleshooting of your Suzuki outboard engine. It details critical procedures, technical specifications, diagnostic guides including error code references, and safety guidelines. Whether you are a seasoned technician or an owner dedicated to preserving the longevity and performance of your marine power unit, this manual serves as an indispensable resource, ensuring the continued reliability and optimal functioning of your DF Series engine.