Who was the first rider to become the Speedway World Champion twice?

Jack Ellis Young (31 January 1925 in Adelaide, South Australia – 28 August 1987 in Adelaide) was a Motorcycle speedway rider who won the Speedway World Championship in 1951 and 1952. He also won the London Riders' Championship 1953 and 1954 and was a nine time South Australian Champion between 1948 and 1964.

In 1951, Jack Young made history by becoming the first second division rider to become World Champion when he won the title at the Wembley Stadium in London. He defeated England's Split Waterman and fellow Australian Jack Biggs in a three way run-off for the title after each had finished the meeting on 12 points.

In 1952 Young moved up a division by joining the West Ham Hammers for a then record transfer fee of £3,750. He also retained his World title in front of 93,000 fans at Wembley, thus becoming the first dual World Champion and the first rider to win the title two years in succession.