2021 Husqvarna FX 450 The pinnacle of Husqvarna offroad competition, the FX 450 uses advanced engineering techniques to not only draw massive power figures from the 450cc engine, but also position the engine closer to the center of gravity to vastly improve handling and maneuverability. The addition of launch control means perfect acceleration off the line, while class-leading ergonomics and traction control keep the rider in full control.