This manual covers Polaris snowmobiles manufactured between 1985 and 1995, encompassing a wide range of models including the 400, 440, 500, and 650 series, along with specialized variants like SKS, SP, GT, and XLT. During this era, Polaris was known for its innovation in snowmobile technology, introducing advanced suspension systems, more powerful engines, and refined chassis designs. These machines, powered by various 2-stroke engines ranging from 400cc to 650cc and typically producing between 45-75+ HP, utilized Continuously Variable Transmissions (CVT) with robust clutch systems. The manual provides in-depth information on these models, reflecting Polaris's heritage of performance and reliability during this significant period of development. The purpose of this comprehensive repair service manual is to provide owners and technicians with detailed guidance for maintaining, servicing, restoring, rebuilding, and diagnosing Polaris snowmobiles from 1985 to 1995. It covers all essential systems, including the powertrain, chassis, electrical components, and bodywork, offering step-by-step instructions, exploded views, and diagnostic flowcharts. Key areas include engine repair, transmission service, suspension and steering maintenance, brake system servicing, and electrical troubleshooting. The manual is designed to empower users with professional-grade repair information, enabling them to perform necessary maintenance and repairs effectively, thereby reducing downtime and repair costs.