The 2013 Kawasaki Ninja ZX-6R is set to return to a 636cc displacement, according to a spreadsheet released by the United States Environmental Protection Agency (EPA). With alleged spy shots of the new ZX-6R already hitting the press, the supersport-class bike noticeably takes a design cue from its liter-bike counterpart — a move that should surprise no one.

Listed by the EPA as making 129 hp (96.4 kW) at the crank, the move to have the 2013 Kawasaki Ninja ZX-6R be a 636cc displacement machine is interesting, as the EPA’s document does not list a 599cc Kawasaki Ninja ZX-6RR analog, something the Japanese brand did last time it bumped its middleweight’s displacement figure beyond the norm.