By the early 1930s, Cordy Milne had started to earn a decent amount of money in racing.

Jack decided that if he and his brother raced and shared expenses, they could make a living from the sport.

Jack sold his service station and purchased a pair of Comerford-JAP Speedway racing machines from England.

In 1936/37 they were joined by Earl Farrand, Byrd McKinney, Pete Colman and Garland Johnson in representing the USA in test matches against the Australians.

In the same year, the Jack Milne Cup was inaugurated to honour the life of the former World Champion; it is still held annually at Costa Mesa Speedway.