Suzuki added this fuel-injected KingQuad 400 variant to its ATV lineup for the 2009 model year, giving the mid-size KingQuad family a sportier, manual-shift alternative to the automatic-tranny versions. It was built around Suzuki’s 376cc single-cylinder utility-ATV platform and positioned as a versatile machine for riders who wanted a more engaging ride without leaving the work-oriented KingQuad range. The nameplate carried the KingQuad formula of selectable 2WD/4WD, shaft drive, and rugged cargo-friendly chassis design, while the fuel injection and semi-automatic clutch gave it a more modern, responsive character.
Over time, the model remained one of Suzuki’s core adult ATVs and continued through later model years with incremental updates rather than a full break in production. Suzuki’s current global and U.S. product pages still list the KingQuad 400FSi as an active offering, showing that the nameplate has remained in continuous production since its introduction. In enthusiast terms, it sits between pure utility and trail-friendly sport utility use: practical enough for chores, but with a transmission and power delivery that appeal to riders who prefer more involvement than a fully automatic ATV. It has become one of Suzuki’s long-running middleweight quads and a familiar part of the KingQuad family.