variator adjustment spacer set Polini Evolution 13x20mm for Minarelli 246.048

These Speed-up shims influence the length of the variator sleeve / bushing. Lengthening can improve acceleration and shortening can increase top end speed. Measure the length of the sleeve before installing the length of your choice. Kit contains 6 Control shims / spacers with 13mm inner diameter and 20mm outer diameter each. Suitable for Minarelli crankshafts.