The Australian Junior Motocross Championship was held at Wanneroo in Western Australia in 2008, where Webster won the 9–12 years Mini Lites class.
[3] Due to the distances involved in competing around Australia, Webster only made one further appearance at the national junior championships, finishing third in the 250cc 13-15yrs class in 2011.
[13] As the event took place in The Netherlands on his favoured surface of sand, he surprised many people when he finished third in the Saturday qualifying race for the MX2 class, beating riders such as Jago Geerts, Alberto Forato and Maxime Renaux.
[14] Webster was given the opportunity to stand in for the injured Benoît Paturel in the MXGP class of the 2020 FIM Motocross World Championship for the JM Honda Racing team.
Australian domestic motocross racing resumed in 2021 and Webster would have a dominant season in the shortened ProMX championship, taking the overall win in the MX2 class in all three contested rounds to be crowned national champion.
He missed four rounds of that years championship after breaking his left foot and right ankle in a training crash but upon his return was able to win the final race of the season.
The championship was so tight that they ended with the same amount of points but Webster took the title with a superior number of race wins (ten throughout the season).
[19] These results would see him selected to represent Australia for the second time at the 2024 Motocross des Nations and being partnered by the Lawrence brothers would mean that he had to ride a 250 in the MX2 class.