I was wondering what i can expect from my setup on my vespa pk50xl… and wondered myself if it’s necessairy to change your gereRATIO. For an optimal reduction power and speed.
My setup is :
-Racing cylinder Polini ALU 75cc 6 ports
-Racing exhaust POLINI PK/XL/HP
-Racing crankshaft Vespa PK50XL
-a standard 16.10mm with a bigger jet
-a standard valve etc
Tnx for helping me [:)]