My Vespa is a 2020 GTS 300 supertech.
I rode it to work on Thursday with no problems. I went out to start it on my break and it idled just fine. It was on the center stand and I was not sitting on it. However, when I gave it gas it bogged down, stuttered and backfired. No CEL.
I had the dealer come pick it up. I was pretty upset since it only had 60 miles on it .... period.
So here's the fix.... Don't expect it to run well when you aren't sitting on it. Apparently, there is a switch that senses whether you are on it or not. If you are not, it just won't let you rev the scoot. It's all in the name of safety.
I picked it up from the dealer, rode it home and it did not miss a lick.
It might be a useful bit of info that may come in handy.
EDIT: It runs badly when on the center stand AND with the traction control engaged. Apparently, and unlike other owners manuals, this info is not in the one for the 2020 SUPERTECH.
Last edited by desliderman on Tue Oct 13, 2020 10:24 am; edited 2 times in total