Husqvarna 150BT 51cc 2.16 HP 2 Cycle Gas Backpack Leaf Blower - 970466901. Owner's Manual. Husqvarna 150BT Gas Backpack Leaf Blower combines a high powered gas leaf blower with state-of-the-art ergonomic design. Powerful Clearing Performance: 2 Cycle, 51cc, 2.16 HP engine has a powerful blowing force (765 CFM, 270 MPH, 22 N), reduces emissions up to 60%, and increases fuel efficiency up to 20%. Ergonomic Harness System: Gas leaf blower backpack features a padded harness, hip belt and weight-leveling load management system for optimal comfort. Easy Operation: Air purge system removes air from the carburetor and fuel system for trouble-free starting, plus the variable speed throttle with cruise control allows for easy operation without the need to regulate the blower's speed. Gas Blowers for Lawn Care: Gas leaf blowers simplify the process of regular yard maintenance and more demanding lawn care tasks, like cleaning up heavy, wet leaves and debris