Neil Hudson won what premier motocross championship in 1981?
Motocross World Championship FIM Motocross World Championship is the premier championship of motocross racing, organized by the Fédération Internationale de Motocyclisme (FIM), currently divided into two distinct classes: MX1 and MX2. Race duration is 30 minutes plus 2 laps per moto. The series runs 18 events with two motos at each round.
Casey Stoner Casey Joel Stoner, {'1': ", '2': ", '3': ", '4': "} , (born 16 October 1985 in Southport, Queensland, Australia) is a retired Australian professional motorcycle racer, and a two-time MotoGP World Champion, in 2007 and 2011 .