 Suzuki saw off a strong challenge from Yamaha to take their second consecutive 500cc crown.Angel Nieto made it three 50cc titles in a row on a Bultaco while Morbidelli would win an impressive double world championship in the 125cc and 250cc divisions.Pier Paolo Bianchi successfully defended his 125cc title while fellow countryman Mario Lega captured the 250cc championship for the tiny Italian concern.