[2] He became a Formula Two racer in 1972, with his best result being a fourth place at the Albi Grand Prix, finishing 17th in the European F2 Championship.

He contested the 1974 Rothmans 5000 European Championship winning at Snetterton and finishing 8th in the Series.

He also competed in the 1977 Shellsport 5000/Libre series and finished fifth in a Radio Luxemburg-sponsored Lola T330-Chevrolet.

In 1974 he tried four times to qualify for Williams, but was only successful in South Africa and Sweden.

In South Africa, the clutch on Belsø's FW failed on the first lap of the race.