variator adjustment spacer set Polini Evolution 16x20mm for Piaggio, Minarelli 246.054 fitting for Aprilia SR Replica 50 MR/LC 1994-1996,

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 16mm inner diameter and 20mm outer diameter each. Suitable for tuning crankshafts with 16mm shaft end.