This manual covers Mercury 30 and 40 FourStroke outboard engines manufactured from 1999 to the present. These engines are known for their reliable Four-Stroke design, water-cooled operation, and CDI ignition systems. They are designed for a variety of marine applications, offering dependable performance for boaters. The engines feature electric start with an option for a manual starter, and utilize unleaded gasoline as fuel. This comprehensive service and repair manual provides detailed information essential for maintaining and troubleshooting your Mercury outboard. It includes instructions and diagrams for key systems such as the electrical, fuel, powerhead, mid-section, and gear housing. Additionally, it covers attachments, control linkage, and the manual starter system. This guide is an invaluable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the engine.