Μηχανάκι as far as I can tell is used for any small two - wheeled motorized vehicle. But there is also σκούτερ, and outer more specific names: μοτοσικλέτα, motorcycle etc. are used.

Instead of "μηχανάκι", it would be correct to say "μηχανή" that means "motorcycle" but also "machine" or "engine".

Are you referring to the second α? The word sounds correct.

We have added bike as an alternative translation.

In all of Greece, actually, and it is accepted as one of the possible translations.