POLINI Vespa Gearbox Kit 23/64 P125-150, PX125-150, Sprint, Super, GTR (Up To 1997)POLINI Vespa Gearbox Kit 23 64 P125 150, PX125 150, Sprint, Super, GTR (Up To 1997) This POLINI Vespa Gearbox Kit allows you to adjust the final drive ratio of your VESPA motor, up to 23 64. This increases performance and efficiency, leading to higher top speeds and lower engine revs at cruising speeds, while also gaining more miles per gallon. Perfect for tuning cylinder kits between 166 and 177cc, as well as performance enhanced 200cc VESPA motor