Dynasties aren’t created in just two years, but in the ultra-competitive world of motocross, back-to-back wins must feel like an eternity. Once again, Suzuki’s RM-Z450 proved to be the pick of the litter, backing up its 2011 performance with another exceptional display in ’12, despite being unchanged. Key to the RM-Z’s success is its class-leading horsepower—just shy of 51 (!) at the rear wheel—but also its crisp and predictable throttle response that allows all that oomph to be effectively utilized by the rider. Combined with its razor-sharp handling, great mid-corner grip and excellent suspension, it’s a hard package to beat. Can Suzuki make it three in a row?