2015 Kawasaki KX™450F, 4-time AMA Supercross Championship-winning KX450F - Following another highly successful year in competition, improvements to the 4-time AMA Supercross Championship-winning KX450F will keep it on top in 2015! It’s no secret that Monster Energy Kawasaki has been dominating the AMA Supercross and AMA Motocross series, with Ryan Villopoto piloting his Monster Energy Kawasaki KX450F race bike to 4 consecutive AMA Supercross Championships in 2011 through 2014. Villopoto’s skills are undeniable, but the race-ready Kawasaki KX450F allows the legendary racer to brake later, carve deeper and accelerate harder thanks to a technology package and powerful yet tractable motor unrivaled by any production motocross bike.