Great bikes are usually the sum of their superlative parts. Case in point: the CRF250X, a.k.a. the ultimate enduro machine. Boasting smooth, torquey four-stroke power via its Unicam four-valve engine, MX-bred suspension and ever-so-handy electric start, the CRF250X simply blows away everyone who rides it. And now with newly remapped ignition timing and revised engine porting, get ready for an encore performance.