On the 6 May 2008, Vaculík gained a Polish speedway licence (Licencja "Ż") at Toruń.[2] and from 4 June 2008 he has taken part in the Polish Championships as a Polish domestic rider.[3]
His only venture into British speedway (in 2018) ended in unfortunate circumstances after he broke an ankle riding for Leicester Lions in only his second outing with them.[4]
In 2019, he rode strongly and finished in 5th place in the World Championship but suffered several injuries that affected his 2020 and 2021 performances.
He was selected as a full time rider for the 2023 Speedway Grand Prix[6] and won the Czech Republic Grand Prix in June and Speedway Grand Prix of Great Britain in September. He went on to secure a career best finish in the World Championship by claiming the bronze medal.[7]
During the 2024 Speedway Grand Prix, Vaculík secured a third consecutive Czech Republic Grand Prix[8] and won the Polish Grand Prix in Wrocław.