NOTE: For Racing you will want to Upgrade to 47mm. However, should you choose to keep the 40mm settings you should get a 50cc Performance Pi WORKS ON: APRILIA: GULLIVER - RALLY - SCARABEO - SONIC - SR 50 MOD. 94-95-96-97 - SR 50 WWW ATALA: CAROSELLO BENELLI: 491 GT - K2 - NAKED 50 - PEPE BETA: ARK - CHRONO - CHRONO 502 - QUADRA - TEMPO BSV: AX - JX-GZ KTM: K 50 MALAGUTI: CENTRO SL - CIAK - F 10 - F 12 PHANTOM 2000 - YESTERDAY MBK: EQUALIS - EVOLIS - FIZZ - FLIPPER - FORTE - HOT CHAMP - MACH G - OVETTO 50 - SORRISO 96 MOTRON: STING - SYNCRO - THUNDER PGO: BIG MAX YAMAHA: AXIS - BREEZE - JOG R 50 - JOG Z - NEO S 50 - VINO - WHY - YE 50 ZEST