Introduced for the 2004 model year, this nameplate marked Kawasaki’s entry into the modern four-stroke 250cc motocross class. It was developed with Suzuki and represented a major shift for the brand, pairing a compact liquid-cooled single-cylinder four-stroke engine with a dedicated motocross chassis rather than adapting an existing road-bike platform. The new machine arrived as part of the broader four-stroke revolution in motocross and quickly established itself as a serious race bike.
The nameplate made an immediate impact in competition, with Kawasaki riders earning championships and major wins right from the start. Over the next several years, Kawasaki steadily refined the model rather than replacing it outright, and some of the most important updates came in the mid-2000s and early 2010s. A major redesign brought an aluminum perimeter frame for 2006, fuel injection arrived for 2011, and later iterations continued to sharpen handling and rider usability. The model was substantially updated again for 2017, reflecting Kawasaki’s ongoing focus on lighter, more responsive motocross hardware.
As a result, this nameplate became one of Kawasaki’s core race-oriented off-road models and a staple of the brand’s KX family. It has remained part of Kawasaki’s motocross lineup through the present day, recognized by enthusiasts for its direct racing pedigree and long development history in the 250cc four-stroke class.