This manual covers the 1991 Yamaha 55 hp outboard motor, a 2-stroke, 2-cylinder marine engine with a displacement of 760cc and a power output of 55 horsepower. Designed for use in marine environments, this gasoline-powered internal combustion engine represents Yamaha's commitment to engineering quality and reliability. Its robust construction and performance specifications make it a dependable choice for a variety of boating applications. This comprehensive Service/Shop Repair Manual provides detailed information for the maintenance and repair of your Yamaha 55 hp outboard motor. It includes every nut and bolt, guiding users through troubleshooting and repair procedures with clear, easy-to-read text and illustrations. This resource is essential for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their marine equipment.