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.

Not a true 600cc-class machine, Kawasaki will have a hard time racing the ZX-6R in any proper┬ásupersport class here in the United States, though we doubt it would be hard for Team Green to get the bike homologated for AMA Pro Racing’s Daytona SportBike class mash-up, but that’s not saying much.

Other pieces of information gleaned from the EPA’s document is that the 2013 Kawasaki Ninja ZX-6R┬áhas a 13,500 rpm red line, optional ABS, four-cylinders, and four-valves per cylinder. Expect the new 6R to debut this fall, at either the INTERMOT or EICMA show.

Source: EPA