use vespa parts. High comp head will help with low end (make your own) pipe carb all of those things will help you make more power. If your bike is stock that fifty jet is too big. I got more pick up by switching back to the 43(stock jet) and ditching the stock air box for a couple layers of panty hose. This won't make it "fast" just better. BTW the 13/13 carb comes with a 66 jet this will also likley be to big for a non kitted bike.