The Mercury Mariner Marathon, produced between 1987 and 1993, represents a robust and reliable option within its class. This first-generation model is powered by a 75 HP, 2-stroke, 3-cylinder engine with a displacement of 1057 cc, featuring a CDI ignition system and water cooling for optimal performance. Its outboard gearcase offers Forward, Neutral, and Reverse gears, and it is designed for efficient operation with a 50:1 gasoline to oil mixture. Weighing approximately 230 lbs, the Marathon is engineered for dependable service, embodying the quality associated with Mercury Mariner marine products. This Workshop Service Repair Manual provides comprehensive guidance for the Mercury Mariner Marathon 75 HP, covering the production years 1987-1993. It details essential maintenance procedures, including specifications for spark plugs and lower unit oil capacity, alongside troubleshooting information and technical data. The manual is an indispensable resource for owners, mechanics, and technicians seeking to understand, maintain, and repair their Mercury Mariner outboard motor, ensuring its continued performance and longevity.