This manual provides comprehensive information for the 1970 Bombardier Skidoo Alpine 399ER, 399R, Invader 640ER, and Nordic 399 snowmobiles. These models represent a significant offering in the snowmobile market, designed for reliable performance in challenging winter conditions. Their robust construction and engineered capabilities ensure dependable operation for recreational and utility purposes.

The purpose of this manual is to serve as a definitive resource for the maintenance, repair, and technical understanding of these 1970 Bombardier Skidoo snowmobiles. It details essential procedures, specifications, and guidelines necessary for proper upkeep and troubleshooting. Owners, technicians, and mechanics will find the information within invaluable for ensuring the longevity and optimal performance of their vehicles.