The Vespa Si style Pinasco 42mm 60cc 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 Ciao version!!
This is the 12mm piston pin version of this kit.
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.
This does not require case modification to fit.
This probably the best 60cc kit you can get for your Vespa based moped.