52CC 2-Cycle 550&636CFM Gas Backpack Leaf Blower Snow Blower With Extention Tube52CC 2-Cycle 550&636CFM Gas Backpack Leaf Blower Snow Blower With Extention Tube. Powerful and easy to start engine in combination with efficient fan design delivers high air speed and air flow. 2-cycle engine design provides fewer emissions, more efficient fuel consumption and less.