In Japan it requires a 原付 (< 50 cc engine-attached (literally)) license which, as the article points out, is easier to get than even a regular driving license. Japan has normal vehicle (which includes mopeds but not motorcycles) in at-only and manual+auto, gentsuki (moped), 125cc, 250cc, 400cc, and > 400cc motorbikes (also in manual and auto flavors), and then various truck and equipment licenses.