Cees Doorakker was the 250cc Dutch champion in 1984 and 1986. In 1986 he also reached the championship in the 500cc class. Doorakkers raced in the Grand Prix road race world championship between 1984 and 1995. Being a privateer without factory supported machines, he scored only a few points, his best result being a seventh place at the Yugoslavian Grand Prix in Rijeka in 1990. That season he reached a total of 39 points, 16th in the final ranking.
In 1991 he finished the season ranked as the top privateer, ranking 14th overall (40 points). Later years were plagued by lack of money, inferior equipment and bad luck, like the jamming of his new engine in the first race of the season in Australia.
In 1995 Doorakkers decided to retire from Grand Prix motorcycle racing. In 1996 Doorakkers drove 125cc go karts (with transmission) for the Dutch championship and ended up 5th. Later on he began motorcycle racing again with titles in the BOTT-class and Supermono; at the same time he raced in the Alfa Challenge with Alfa Romeo 156 and 147.