Primary drive by Polini with a gearing of 17/45 teeth. A longer drive is recommended, if the motor has been tuned or the capacity increased (eg. a big bore cylinder). The additional torque now available can be translated into high top end speed using a longer final drive. Suitable for Vespa LX, Sprint, Primavera 125 4-stroke, Piaggio Liberty 125 3V. Ratio: 17/45 teeth ratio: 2.65:1