Description Malossi 124cc Cylinder Kit for Yamaha 100cc Aerox / BWS. Tuned correctly with this kit you should expect a significant increase in power and torque. It is recommended that you also install a performance exhaust carburetor and manifold. The Malossi PHVB Carb Kit, and Tecnigas RSII Performance Exhaust are a great addition to the installation of this cylinder kit. When installing a cylinder kit it is necessary to increase the jet size in the carburetor. Failure to do so may cause engine damage. Malossi Performance Cylinder Kits are 100% designed and manufactured in Italy, providing the best balance between performance and reliability. Tuned correctly with this kit you should expect a significant increase in power and torque. It is recommended that you also install a performance exhaust and carburettor with this kit. The Malossi PHVB Carb Kit, and the Tecnigas Performance Exhaust are a great addition to the installation of this cylinder kit. *Performance scooter parts do not come with a warranty*