Kawasaki introduced this nameplate for the 2018 model year as a new lightweight middleweight sportbike aimed at riders who wanted approachable performance in a full-fairing package. It arrived with a clean-sheet redesign that replaced the earlier 300-class entry in Kawasaki’s small-displacement sport lineup and quickly became one of the brand’s key global models. Kawasaki’s own materials describe it as an important worldwide seller, with strong demand in markets such as the United States, Europe, and China.
The model’s history is tied to Kawasaki’s broader Ninja family, but this specific 400-class nameplate is distinct from earlier 400-cc Kawasaki sport models that carried different names. In Kawasaki’s product literature, the model appears for 2018 through 2023, after which Kawasaki moved the segment forward with the Ninja 500 for 2024. That makes this a single continuous production run rather than a revived nameplate.
Enthusiast interest in the model centered on its balance of everyday usability and sporty styling, along with the fact that it brought a modern, accessible platform into the 400-class supersport space. It served as a bridge between beginner-friendly performance and more serious sport riding, helping define Kawasaki’s modern small-bore Ninja identity before being superseded by the larger-displacement successor.