This unit comes with the Award winning 70cc Air Cooled ZongShen Engine, Best Chinese Motor 3 years in a row! Thicker Fork Tubing and Stiffer Springs ensure this unit can take maximum abuse while riding! Bottom-end acceleration mwith strong midrange and eye-opening top-end! Smooth Shifting, Reinforced 4 Speed Transmission! Exhaust is outstanding and can be upgraded very easily!