Polini Roller Weights 23mm X 18mmCOMPATIBILITY: BMS – 250cc Scooters, Go KartsCFMoto – 250cc Scooters, CruisersDaelim – S 250Diamo – 250cc ScootersHonda – Foresight 250 ’98-99, Forza 250/300i, Jazz-Reflex 250, Pantheon 125/150, SH300iKinroad – 250cc Go KartsKymco – Bet & Win (B&W) 250, Grand Dink 250, People 250/300i, Xciting 250/300, Xciting 250/300, X-Town 300i, Yager 300, Yup 250Lance – 250cc Scooters, Go KartsRoketa – 250cc Scooters, Go KartsTank Sports – 250cc ScootersMany Other 250cc CN or CFMoto Based EnginesWe highly recommend that you begin by upgrading the variator roller weights before engaging in any performance upgrades. This is the simplest of upgrades and the least expensive. This is a minimal investment and offers a maximum return.The main rule for tuning variators is the lighter the roller the more rpm’s are needed to push the rolls outwards through centrifugal motion to set the gear change in motion. Heavier roller weights need lower rpm’s to start moving.Heavier roll