This workshop service repair manual covers the Mercury Mariner Sailpower outboard engine, a reliable and efficient power unit designed for a variety of marine applications. Known for its robust construction and dependable performance, this engine delivers 9.9 HP and features a water-cooled, CDI ignition system, and operates on unleaded gasoline. Its 2-stroke engine design and forward, neutral, reverse gear shifting provide straightforward operation. The engine's typical weight is approximately 115-120 lbs, with shaft length varying by specific configuration, making it a versatile choice for many boaters. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner Sailpower outboard. It details procedures for routine servicing, including lubrication and fuel system maintenance, as well as component replacement schedules for critical parts like the water pump impeller. The manual also addresses common issues such as starting problems, overheating, and performance degradation, offering guidance to help owners and technicians keep the engine in optimal working condition. All instructions are presented in English to ensure clarity and ease of use.