Which ANA motorcycle engine is named after a dragon in Norse mythology?
ANA (motorcycle):  The ANA used a wide variety of different engines: Fafnir, JAP Precision, Abingdon King Dick, as well as Sturmey-Archer gearboxes. Fafnir: In Norse mythology, Fáfnir (Old Norse and Icelandic) or Frænir is a son of the dwarf king Hreidmar and brother of Regin, Ótr, Lyngheiðr and Lofnheiðr. Fafnir:  After being affected by the curse of Andvari's ring and gold, Fafnir became a dragon and was slain by Sigurd.
Fafnir became a dragon