What is the history behind the Kawasaki ZZR600?

The Kawasaki ZZR600 is a sports motorcycle manufactured by Kawasaki and is designed from previous generation sportsbikes but has more ergonomic seating positions and different graphics. The motorbike was introduced in 1990 with ZZR600 D1 model, and with D2 and D3 models being presented in the following years after that. Different models were being made up until 2006 when the ZZR600 E6F model was presented. This new and final model had an engine that powered all of the D and E series bikes.