The American Sportworks 3171 Black Widow off-road go kart is a fast and fun go kart for kids ages 13 and older.  With a powerful 136cc 4-stroke engine and automatic CVT (continuously-variable) transmission, it can travel up to 24mph.  And thanks to hydraulic disc brakes, it can stop on a dime.  The full suspension makes it easy to control.  And for added safety, it is equipped with 1-inch brush bars and 3-point shoulder/lap belts.