The Mercury Mariner 15 HP 2-Stroke outboard motor, manufactured between 1986 and 2003, represents a robust and reliable choice for various marine applications. Engineered with a 2-cylinder, 2-stroke engine displacing 262 cc, this motor delivers 15 horsepower at 5000 RPM, driven by a carburetor fuel system and CD ignition. Its water-cooled design ensures efficient operation, while the forward, neutral, and reverse gear system with a typical 2.15:1 gear ratio provides versatile control. Weighing approximately 104 lbs, this outboard is designed for dependable performance on the water. This Factory Service Repair Manual provides comprehensive guidance for the Mercury Mariner 15 HP 2-Stroke outboard motor. It covers essential maintenance procedures, including lubrication specifications for 2-stroke outboard oil and the 50:1 fuel-to-oil mix ratio, along with routine service items like spark plug gap and gearcase oil capacity. Technical specifications detail engine design, performance, and propulsion systems. Furthermore, the manual includes information on operation and troubleshooting, empowering owners, mechanics, and technicians to effectively maintain and repair their Mercury Mariner outboard for optimal performance and longevity.