Kawasaki files ER400 registration with CA Air Resources Board

Kawasaki released the Ninja 400 this year to replace the Ninja 300 and meet Euro 4 regulations. The Japanese brand has typically offered naked variants of their Ninja sport bikes in the form of their streetfighter Z series. The Ninja 300 led to the stripped Z300 (pictured above), and now rumor has it that the Ninja 400 will get a Z400 sibling.

RideApart got their hands on Kawasaki’s recent filing with the California Air Resources Board. Records that shows that the Japanese company registered both the 399cc Ninja 400 and ER400 with the state.

Kawasaki gave us a Z1000, Z900/RS, Z800, Z750, Z650, Z300, Z250, and Z125. Kawasaki even offered a Z1300, Z1100, and Z550/Z500 once upon a time. Meanwhile, the 2018 Kawasaki Ninja 400 is powered by a 399cc water-cooled, 4-stroke parallel twin that makes 44 PS at 9,900 rpm and 33.4 Nm of torque at 8,250rpm. The last time a Z400 was available was back in the mid ‘70s to early ‘80s. It’s only natural that a new Ninja 400-derived naked sport bike will be revealed in the upcoming months.