Stihl BT 131 Earth Auger, 36.3 cc EngineSTIHL BT 131 Earth Auger, 36. 3 cc Engine If you are looking for a powerful and lightweight earth auger, turn to the STIHL BT 131. This tool features a fuel efficient engine that will allow you to work longer with fewer refuels than previous models. Plus, with its vertical pleated air filter, this auger offers better air filtration for a longer product life. Its semi automatic choke lever enables a simplified starting procedure that helps reduce the