This manual covers the Suzuki DF90, DF100, DF115, and DF140 4-stroke outboard motors produced between 2002 and 2009 (K2-K9 models). These engines are engineered for reliable performance, featuring an inline 4-cylinder configuration with electronic ignition and fuel injection. Designed for a wide range of marine applications, these Suzuki outboards are known for their efficiency and durability, making them a preferred choice for both recreational and professional use. This comprehensive guide is ideal for owners seeking to perform maintenance and repairs themselves. The purpose of this 616-page service manual is to provide detailed instructions for the maintenance, repair, and diagnostics of the specified Suzuki outboard motors. It includes thorough coverage of periodic maintenance, engine control systems, electrical components, fuel systems, power trim and tilt, and lower unit assemblies. With clear, step-by-step instructions, zoomable illustrations, and detailed exploded views, this manual is an essential resource for owners and technicians. It offers comprehensive troubleshooting and diagnostic support to ensure immediate problem fixing and optimal engine performance.