Stihl's TS 500i is designed for superior handling during the toughest jobs. Featuring the handheld outdoor power equipment industry’s first electronically controlled fuel injection system, the TS 500i increases power by 17% and cutting speed by 15%, as compared to the STIHL TS 420. The low-emission fuel injected cut-off saw provides optimal torque throughout the rpm range. No carburetor means no choke needed – just purge and pull the start cord!