But, concerning police radar and technical control speed rollers, I found and tested sucessful solution :-)
A friend of mine programed and made me adjustable cdi of oem kymco unit that costed me 30 eur.
Tested it and it works :-)
Now I have 4 options/levels of rpm's
5000 rpm max,6500, 8500 and no rev limiter
So, whatever modifications you do(comletely de-restricted, big bore, racing variator, upgraded carb),
cdi could be adjusted not to make scooter go faster than 45-50 km/h
And it's operated by front brake lever clicking scheme !