The Vespa Ciao Pinasco 75cc kit is a real ripper!
Nikasil lined Aluminum Cylinder with a Ciao low profile head. Meaning you don't have to trim any head fins to fit this into your frame.
This is the 12mm piston pin version of this kit, there is a10mm version available here. If you are in the United States, more than likely you have a 12mm piston pin, and this is the for you. If you are not in the US, and or have an older Ciao, you might 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.