There is no doubt that the current wave of 450cc motocross machines are the most potent, high-tech, and best-handling bikes to ever rip a berm to shreds. These machines have changed the very sport in which they compete, making track designers push the limits with bigger and badder obstacles, ones that yesterday's machines could have only dreamed of clearing. This year, the bike that pushes the limits in the class is the Kawasaki KX450F. It's light and agile, handles with finesse and control, and lays down ungodly power. And yet its customizable electronics allow weekend warriors and factory riders alike to access its impressive performance.