He then got his break when he tagged along with leading Adelaide sidecar rider Len Bowes to the Northern Park Raceway in Melbourne.

After finishing second to Sydney's Jim Airey at the 509 metres (557 yd) Sydney Showground in 1970, Boulger won his first Australian Solo Championship in 1971 at Perth's ⅓ mile (586 metres (641 yd)) Claremont Speedway after a bold passing move on local favourite Chum Taylor in the last corner of the deciding heat to give him a 15-point maximum.

He would place once more finishing 3rd in 1979 at the 302 metres (330 yd) Olympic Park Speedway in Mildura behind local favourites Phil Crump and Danny Kennedy.

Boulger won the inaugural Australasian Championship at the Western Springs Stadium in Auckland, New Zealand in 1976 defeating Billy Sanders, Phil Crump and multiple World Champion Ivan Mauger (the Australasian Final was introduced as a World Championship qualifying round for Australian and New Zealand riders).

Boulger has been a long time supporter of Sidewinders and during the early-mid 1980s was a mentor to a number of younger riders including Steve Baker, Mark Fiora, Shane Parker, Craig Hodgson and Shane Bowes, the son of Boulger's long time friend and the 1968 Australian Sidecar Champion Len Bowes.

In 1985, he started racing Sprintcars before moving on to drive Speedcars with some success, including winning the prestigious "Harry Neale Memorial" at Speedway Park in 1987.

He would remain with the Lions until 1979 when he retired from British League racing in order to spend more time with his family and on his business interests in Adelaide.

[11] Boulger also rode in the 1977 World Final at the Ullevi Stadium in Göteborg, Sweden, where on a wet track he finished 12th with 5 points from his 5 rides.