The input shaft is also known as the lay shaft or the half axle. Together, the primary driven cog and the primary driven gear cogs make up the primary drive assembly. The set of gear cogs make up the smaller half of the secondary drive gear ratio assembly. The main difference between the various shafts available is the length and diameter of the bearing and bush or the differing number of teeth on each cog.

Piaggio Part# 094419-94419