This Mercury Racing Service Manual is a must-have for any owner of a Sport, Torque, &  Fleet Master Gearcase 90-842009. It provides comprehensive information on how to operate and maintain your outboard motor effectively. With details on everything from engine components to electrical systems, this manual will help you keep your boat running smoothly. The manual is a genuine NOS (not otherwise sold) item, making it a rare find for collectors and enthusiasts alike. It is suitable for use with Mercury outboard motors and is an essential addition to any boat owner's literature collection.