2013 Kawasaki KFX 50, 2013 Kawasaki® KFX® 50 For youth ATV riders age six years and older, proper learning starts with the Kawasaki® KFX®50. 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. Minimum age requirements vary by state. Please verify minimum age requirements with the dealership.