This comprehensive service manual covers Mercury Snowmobiles manufactured between 1974 and 1976. Mercury, a brand with a strong heritage in marine engineering, ventured into the snowmobile market during the mid-1970s, a dynamic period for the industry. These vintage machines, typically powered by air-cooled 2-stroke gasoline engines ranging from approximately 25 to over 70 horsepower, featured advanced designs for their time, including torque-sensing clutches, V-belt drive systems, and robust chassis. This manual provides detailed information essential for the upkeep and repair of these unique vehicles, ensuring their continued performance and reliability. The purpose of this full service repair manual is to provide owners, mechanics, and technicians with complete guidance for maintaining and repairing their Mercury Snowmobiles. It covers all major systems, including engine overhaul, drivetrain components, electrical systems, and chassis. Within its pages, you will find detailed procedures for scheduled maintenance, troubleshooting common issues such as carburetor fouling and clutch wear, and comprehensive rebuild instructions for engines and clutches. The manual also includes crucial technical specifications, tolerances, and torque values, along with clear wiring diagrams and diagnostic procedures, all presented in English for easy comprehension and application.