Polini 5.5 – 7 Gram Roller Tuning Kit 15 x 12 for Yamaha / Vmoto / Chinese 50cc 2T Models Scooter tuning can often be won or lost in the transmission. This kit cleverly allows you to exchange the weight component of the roller from the outer plastic shell, giving you a huge array of combinations for fine tuning of your transmission. the kit includes x4 different weight sets from 5.5 – 7 gram weight inserts – and remember, you can run combinations in between that of 3 x 3, giving you am incredible amount of tunability. The outer plastic shells can also be purchased separately when they wear out!
