For the person who has everything including a paiinfully slow Vespa. Polini Big Bore Cylinder Kit for Vespa 50cc 4 Valve engines, like the one in your pokey Primavera or sluggish Sprint. Perk that Vespa up and stop Flintstoning away from stop signs.
All Aluminum, with a Nikasil cylinder liner, and an excellent value. It's Winter, and if you're not out riding, you might as well be taking your Vespa apart in the Garage.

And of course, we have the Malossi Big Bore Kit for 2 and 4 Valve engines.