Jim Adema was a snowmobile racing star during the first half of the 1970s. He was inducted into the Snowmobile Hall of Fame in 1988. An independent oval race driver, Adema won a record setting number of races from 1970 to 1975, all while riding on one of his modified Sno-Jets, each of which were ThunderJets models.Collaborating with Sno-Jet's Advanced Research Team in 1970, Adema tested and advised on how to improve the new ThunderJet racer which, at the time, was unstable and not competitive.