This manual covers the 1981 Polaris Gemini snowmobile, a model recognized for its reliability and performance during its production era. As a product of Polaris Industries Inc., a long-standing manufacturer of powersports vehicles, the Gemini was designed for trail riding and offered a dependable experience for its owners. Its engineering reflects the practical advancements in snowmobile technology of the early 1980s, focusing on robust construction and straightforward operation. This snowmobile represents a significant part of Polaris's heritage, providing a capable platform for winter exploration. This comprehensive service and repair manual provides detailed information for owners, mechanics, and technicians. It covers essential maintenance procedures, including oil changes, lubrication, and component inspections, alongside in-depth troubleshooting and repair instructions for all major systems. Areas addressed include the engine, fuel, ignition, cooling, exhaust, drive, suspension, steering, braking, and electrical systems, as well as bodywork and chassis. With step-by-step guidance, abundant illustrations, and factory-level technical specifications, this manual ensures proper upkeep and repair, enabling users to maintain their 1981 Polaris Gemini snowmobile effectively and economically.