KFX400

Introduced for the 2003 model year, this sport ATV marked the brand’s entry into the liquid-cooled four-stroke performance quad class. It arrived as a lightweight, trail-oriented machine aimed at riders who wanted sharper handling and more modern engine design than the older two-stroke sport quads that had defined the category. The nameplate was part of a short early-2000s collaboration era, when several closely related sport ATVs were shared across different badges and markets. During its run, it became known as one of the most balanced 400-class sport quads of its day, with a reputation for friendly power delivery, agile chassis dynamics, and broad appeal to both recreational riders and grassroots racers. The model appears to have remained in production through the 2006 model year, after which the nameplate was discontinued rather than carried forward into a second generation. Its brief life span has made it a familiar reference point among enthusiasts looking back at the compact high-performance ATV boom of the early 2000s.