DR 70cc Cast Iron Cylinder Kit "Sport" by Italian company DR. Known and popular for its reliability and durability. The cylinder has 6 transfer ports and a piston with 2 rings. With enough power and torque, it can reach 7 to 10hp. A robust cylinder kit with sufficient power for small money.Properly set up and adjusted (with appropriate carburetor and spark plug), this kit will go lots of miles without requiring too much maintenance.