List of Grand Prix motorcycle racing World Champions by year
List

List of Grand Prix motorcycle racing World Champions by year

Section Title: List
Table Section Text: None

Year	750cc	500cc	350cc	250cc	125cc	50cc	Sidecar

1977	United States Steve Baker (Yamaha)	United Kingdom Barry Sheene (Suzuki)	Japan Takazumi Katayama (Yamaha)	Italy Mario Lega (Morbidelli)	Italy Pier Paolo Bianchi (Morbidelli)	Spain Ángel Nieto (Bultaco)	United Kingdom George O'Dell United Kingdom Kenny Arthur United Kingdom Cliff Holland (Windle-Yamaha) (Seymaz-Yamaha)

1978	Venezuela Johnny Cecotto (Yamaha)	United States Kenny Roberts (Yamaha)	South Africa Kork Ballington (Kawasaki)	South Africa Kork Ballington (Kawasaki)	Italy Eugenio Lazzarini (MBA)	Spain Ricardo Tormo (Bultaco)	Switzerland Rolf Biland United Kingdom Kenneth Williams (TTM-Yamaha) (BEO-Yamaha)

Sentence(s)

In the 250 and 350 classes, Ballington on his Kawasakis in 1978, capturing world championships.

final_sentence: In the 250 and 350 classes, Ballington on his Kawasakis in 1978, capturing world championships.