This manual covers Ski-Doo snowmobiles manufactured between 1970 and 1979, specifically detailing models from 1971 through 1978. Ski-Doo snowmobiles from this era were pioneers in the industry, known for their robust engineering and performance in challenging winter conditions. This period saw significant advancements in snowmobile technology, and this manual provides in-depth information to help owners understand and maintain these iconic machines. The comprehensive coverage ensures that the unique qualities and reliability of these vintage snowmobiles can be preserved. The purpose of this Service Repair Workshop Manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of Ski-Doo snowmobiles. It covers all major mechanical, electrical, and bodywork systems, including engine assembly and disassembly, fuel and ignition systems, clutch and drive systems, braking, suspension, and track components. The manual offers step-by-step instructions, diagnostic procedures, and information on various accessories, enabling both professional technicians and enthusiastic owners to keep their snowmobiles in optimal working condition.