You should be looking to import a K class car. The K class, is not microcar now, but used to be when it was 360cc. All the hard work has been done for you, including making the engine bigger. Some of the designs are bonkers. So dreams do exist.
The most generally accepted upper limit for microcar engine displacement is 700 c.c.
K class cars still have to adhere to the 660 cc limit first enacted in 1990.
With MAXIMUM allowed length of 3.4 meters/ 11.2 feet, and width of 1,48 meters/ 4.9 feet, I'd say that size wise they still qualify even if their engines push the upper limits of displacement.
The fact that they perform well should not be held against them, as all cars have generally improved over time.
Curiously, the horsepower is still limited to 63 based on the fact that this was the most hp being made by any of the manufacturers when the last upgrade in displacement was allowed.
It is said that some of the higher performance models, such as the Autozam Az-1 and Suzuki Cappuccino with turbos and intercoolers residing atop their twin cam 3 cylinder engines, exceeded these limits but lied about their extra pep.
I do concede that their are worlds of differences in driveability, safety, reliability (possible contender Goggomobiles), handling, ride and acceleration, as well as top speed, and that these cars deserve to be in a different class of sorts to reflect these improvements.
But if capacities are still used to define a microcar, then these deserve mention as modern macro micros, or other similar moniker.
There are obviously groups of micros below 400cc, 200 cc, and 50 cc.
What moniker would you use to describe a TG 500?
