There are two different types of selector box for the motors of the PX range “old PX” and “PX Lusso”. Earlier models of Vespa such as the Sprint/ Super/ Rally also had two separate versions for their 1st and 2nd series. The position of the selector rod in 3rd gear in some of the versions can differ by up to 1.5mm. Regrettably the manufacturers production tolerances can vary. An original motor with 7 – 10 PS can still operate reliably under these conditions but a tuned motor requires more precision.
We at SIP contacted DRT seeking a solution to this lack of an exact solution and were rewarded with the production of selector box spacers with 3 different thicknesses to rectify the problem. These spacers fit all large frame VESPA models from the VNA/ VNB onwards.
OEM Numbers (for the purpose of comparison) spsk OVpres 03050/pz030 (Old-PX/E) - 22271 (DRT)