Experience the exhilarating 2008 QuadSport Z90. The QuadSport Z90 is designed for adult-supervised riders age 12 and older, and includes many safety features, such as simple screw-type throttle limiter which allows parents to control maximum speed that make learning to ride a safe and fun experience. Value, aggressive R450-like styling, ease of use and reliability, these are traits of the QuadSport Z90.