Tiered licensing is still in place all over Europe and Australia and was recently modified to include the A2 class that allows 47hp or .2kW/kg. Which spawned the jump from 250cc to the new 300 class bikes which the R3 has 321cc in a block that can also be fit with 250cc pistons and crank for those markets that still demand a displacement restriction.
.
.
https://www.autoevolution.com/news/m...ned-90006.html
.
150cc air cooled, kick start bikes are still popular in India because they are so cheap.