mostly under 200cc not 600cc because taxes are based on engine displacment, even if it's locally manufactured. This is why in Indonesia, and Philippines it's quite hard to find a good bike 500cc+
in Philippines you can not do the highway on a lower cc bike, the KTM 390 or such, gets away if you "resticker it" but they're onto that, supposedly, though used you can get a ninja for 2-3000 USD. Not worth it, though.
Indonesia, is more fun but same, road conditions are bad, ironically PH has better roads, but shitter people/cars.
once you hit thailand/malyasia,singapore, things get better road/safety wise but people can't drive (ergo asians can't drive meme) since highways are a less than 20 year invention, yeah, really - that's why it all looks "new" and being in a car is better because, they wil fucking clip you.
vietnam, indonesia, malyasia, china and japan are 100% okay in motorcycle since 99% of the population is poor that's all they can afford and safety in numbers.
T. digital nomad traveller