Top Performances have introduced a line of high performance racing aircooled kits. Depending on the model of scooter it comes with up to 8 transfer ports, which make for excellent gas exchange and good performance. Power is up to 12-13 Bhp. As with all racing cylinders the use of a larger carb and a racing exhaust is a good idea to exploit the engine's full potential. Compatible with: - Aprilia: Scarabeo 50 Piaggio_S - Gilera: Runner SP 50 -05_S, Stalker 50 AC_S, Thyphoon 50 AC_S - Piaggio: Liberty 50_S, Vespa 50 ET2_S, Zip 50 2000_S