When Yamaha dropped the reverse-top-end bomb on the 450cc class in 2010, the YZ450F was radical and readily embraced by professional racers. Thankfully, the all-new design has proven reliable for amateur riders, too. It runs hard and stays strong. After such a major redo, Yamaha is going with small-but-welcome changes for ’12. The changes are more extensive than in ’11, and aside from the addition of black rims and a gold chain, all are improvements the rider can feel.