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Heck, even smelly 2-stroke scooters are popular here, mostly because they're cheap. Larger bikes have emission norms, but I don't know how stringent they are. My Teresa, for example, complies euro2, and is equipped with EFI (AFAIK it has a narrow band O2 sensor, it's closed loop at lower revs/load, and it becomes open loop at a point) and a cat. For euro3 f650s needed a 2nd spark plug (until 2004 they had only one spark plug, which is interesting because the former, carbureted models had 2).
And I don't know how these norms compare to car norms...
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