Scooter (motorcycle) There have been scooters with fixed engines and chain drive, and there have been underbones with swingarm-mounted engines. A twenty-first century example of variance from the typical scooter layout is the Suzuki Choinori, which had both its engine and its rear axle rigidly bolted to its frame. Motor scooters are popular in most parts of the first world, Europe (particularly Italy and the Mediterranean), Japan and Taiwan, but not the US. They are even more popular in most parts of the developing world, particularly in countries such as India, Indonesia, Thailand, Vietnam, and China where there is local manufacture. Parking,
Scooter (motorcycle) small motor scooter. The emissions of mopeds and scooters have been the subject of multiple studies. Studies have found that two-stroke 50 cc mopeds, with and without catalytic converters, emit ten to thirty times more hydrocarbons and particulate emissions than the outdated Euro 3 automobile standards. In the same study, four-stroke mopeds, with and without catalytic converters, emitted three to eight times the hydrocarbons and particulate emissions than the Euro 3 automobile standards. Approximate parity with automobiles was achieved with NOx emissions in these studies. Emissions performance was tested on a g/km basis and was unaffected by fuel economy. the