Polini Reed Valve for 50cc 2-Stroke Air or Liquid-Cooled Engines COMPATIBILITY: Aprilia – SR R-Factory ’04-07 (Piaggio Engine), SR R-Factory Iniezione (Piaggio Engine)Derbi – GP1 50 2T ’01-03Gilera – DNA 50 2T, Easy Moving 50 2T, Ice 50 2T, Runner Pure Jet 50 2T, Stalker 50 2T, Storm 50 2T, Typhoon (X) 50 2TItaljet – Torpedo 50 2T (Piaggio Engine)PGO – Star 50 2TPiaggio – Diesis, Extrem, Fly, Free, Liberty, MC2-98, NRG MC3, Quartz, Sfera, Zip Fast Rider, Zip SPVespa – ET2, LX50**NOTE: DELIVERY MAY TAKE UP TO 2-3 WEEKS****