The youngster began racing when he was just seven. Starting on minimotos Hart went on to finish runner-up in the minimoto North East Championship in 2013 and the following year he was second in the British Minibike Championship and again he was runner-up in 2016.
Apart from the minimotos he also rode in the Formula 125 series on an Aprilia in 2016. However, because of his age, he couldn’t start until mid-season. Once old enough it didn’t take him long to show his talent. He managed his first race victory in the class just six weeks after starting and completed the year with five wins. In the UK minimoto Championship, he finished second.
In 2017 he had a fantastic season. He competed in Melville Club and Open F125 Championships winning both titles. On top of that he won the Knockhill F125 championship.
Hart also rode on the continent in the European Talent Cup. Jack Hart and his family found themselves up against teams with serious budgets, technical equipment and technicians. With just his Dad as the mechanic, the season was tough but he learned a great deal from some of the best riders in Europe. He was also given some guidance by World Moto3 rider John McPhee. During the campaign, he finished inside the top twenty twice. At the Ricardo Tormo circuit in July he missed out on his first point by one place, finishing 16th, after 17 laps.
Jack Hart competed in the first ever British Talent Cup championship in 2018 and scored 37 points. He ended the year with two top ten finishes. He was invited back to compete in 2019. Also in the 2018 season Jack Hart raced in the British Motostar championship. he ended that standard class Moto3 season in 11th and with a best of fourth in the final round.