They laughed at the brash American with the dirt-track style. Then Kenny Roberts won three straight 500cc world titles — and changed how everyone rides. 🇺🇸🏁 #OneLungRacing #KennyRoberts #GrandPrix #motogp #Yamaha #roadracing #twostroke #2stroke #motorcyclehistory #moto #racing #motorsport #legend #vintagemotorcycle #bikelife #twowheels #classicmoto #500cc #GP #goat