If I wanted to ride something with that small displacement then I would just ride a motorized bicycle because where I live they are treated to the laws governing bikes instead of motor vehicles.
So no registration, no insurance, not even a license is necessary, and I can ride them in the bike lane without getting shit. Yet because they are lighter they tend to have more zip when puttering around making them more fun to ride imo.
The main downside is they tend to need a lot more maintenance and usually something you put together yourself, so mechanical skills are a must.
