Still lots of two-stroke, but probably better maintained or the more modern ones run a little cleaner. The biggest difference is in tuktuks and taxis. Lots (most?) have been CNG for years, and now there are more and more e-tuktuks. It's not clean forest air, but the difference from back in the old days is dramatic.Many of the newer scooters and mopeds that I saw in Thailand were electric. But the older ones appear to have two-stroke engines (which tend to spew black smoke)