Troy-Bilt Squall 2100 21 in. Single-Stage Snow Thrower 31AS2T5F766 NEWSanders, Polishers, & Grinders. Rugged 208cc 4-cycle OHV engine delivers reliable power and performance. Simple push-button electric starting makes it easy to get to work. Auger-assisted drive makes terrain traversal easy for maximum clearing capacity. Polymer chute with 180 degree rotation for clearing direction setting..