Airsal have taken the “70” sports cylinder kit and have come up with this “77”cc racing cylinder kit. Includes all parts for installation: gasket set, piston, piston rings etc. Aluminium with Cast aluminium for improved heat dissipation with a hard chromed bore for wear resistance. Smooth torque and great performance make this cylinder great value for money. No additional work to the crankcases is required and the original head is retained.