This manual covers the Polaris 400 Snowmobile, produced for the 1985 and 1986 model years. These snowmobiles are recognized for their robust engineering and reliability, embodying Polaris's legacy in snowmobile manufacturing. The 400 series typically offered a balance of performance and value, making them a popular choice for recreational riding. This factory service repair manual provides comprehensive information to ensure these machines continue to perform optimally. The purpose of this manual is to serve as a definitive resource for the maintenance, diagnosis, and repair of your Polaris 400 Snowmobile. It includes detailed procedures for all major systems, including the engine, drivetrain, suspension, electrical, and braking systems. You will find step-by-step instructions for routine maintenance, troubleshooting common issues, and performing complete overhauls. This guide is designed to assist owners, mechanics, and technicians in keeping their 1985-1986 Polaris 400 Snowmobiles in excellent working condition.