Kawasaki engine. Only 10 hours! Exmark Radius X-Series zero-turn mowers deliver the cut quality and durability professionals demand with a host of new features and innovations. Powered by Kawasaki FX engines, with Hydro-Gear integrated transmissions and up to 10 mph fwd. ground speed, Radius X-Series improves productivity, but a full-suspension operator seat with operator preference dial and elastometric vibration control (EVC) means maximum comfort. 60-inch UltraCut mower deck.