The Vespa Si style Pinasco 75cc kit is a real ripper!
Nikasil lined Aluminum Cylinder with a Vespa Bravo or Si Style head. Meaning more aggressive fin style for maximum cooling. That aggressive head won't fit in your Ciao frame though, so if you have a Ciao you need the 10mm, or 12mm Ciao style kit.
This is the 10mm piston pin version of this kit, there is a 12mm version available here. If you are in the United States, more than likely you have a 12mm piston pin, and this is not for you. If you are not in the US, and or have an older Ciao, you probably have a 10mm piston pin. The only way to be sure is by pulling your jug off and checking.
If you don't want to worry about it, you might as well upgrade your crank at the same time.
Since this is the big boy of Vespa kits, you will need to split your case, and bore it out a bit so that the sleeve of this cylinder will fit.
This probably the best kit you can get for your Vespa based moped.