Modern Vespa

Vespa et2, 2 stroke or 4 and tuning options?

My '03 is a 2-stroke.
The lack of responses here is likely due to the very wide array of tuning options. You can literally 'upgrade' almost every single part on a 50cc although quite a few are negligible unless you're making several upgrades at once.

I'd heavily suggest you look through some of Fabio Dougie's posts.

It might also be because the title of the thread gives no idea what it's about. The OP also doesn't really state what he needs the bike for, whether he has a full license etc, whether he has the mechanical knowledge to tune the bike or would be paying a mechanic, what his budget is and perhaps where he's located. I guess it makes it very difficult for people to help so many would simply move on. That's my opinion anyway.

PS I don't know anything about tuning (or anything else for that matter).

Definitely 2 stroke....

See this>>>> My 50cc Challenge - ET2