You have lots of options then! A pipe and carb upgrade on the stock cylinder will help, but if you really want to go faster you'll want to install a cylinder kit.
The 47mm "80cc" polini kit is super popular, but has been out of stock for ages because of covid. The 48mm "80cc" BRN kit is available, and while it requires some cleanup work due to poor casting, it's a good kit. The 51mm "90cc" BRN kit is pretty extreme and I wouldn't recommend it for most folks. The 48mm parmakit is generally seen as not very good.
V1L kits will not work with your motor. Those are for case-inducted motors.
V1A kits will work, but you'll have to lose the cooling fan shroud (and the fan won't do anything).
There are other kits that aren't really available any more, such as the 43mm DR, some 50cc kits, etc.