This is Echo's 21.2 cc Professional-grade, 2-stroke engine for outstanding performance. Waterproof stop switch and throttle control located at operators fingertips. Kickstand for easy storage, worm gear-type transmission (42:1) reduction) provides high tine rpm and high torque. Four, 10-tooth reversible, hardened-steel tines feature a lifetime warranty and provide smooth tilling action for up to 9" wide furrows.