2013 Kawasaki KFX 50, 2013 Kawasaki KFX50 Youth ATV, Very Low Time and a Great Christmas Gift Idea! - Kid-Sized ATV is Back! For youth ATV riders age six years and older, proper learning starts with the Kawasaki KFX50. Featuring a wide 27.6-inch stance, full floorboards and environmentally friendly air-cooled, four-stroke engine, the KFX50 makes a good foundation for young learners, thanks to its intelligent parental control features, easy electric starting, and beginner friendly performance.