He was the 1974 F.I.M. world champion in the 250cc class on a KTM motorcycle. He won two more 250 world championships in 1977 and 1978, again while riding KTM motorcycles. In 1978 he was a member of the winning Russian team in the Motocross des Nations. Moisseev, like many Russian sports stars of his era, was enlisted in the Russian Army, rising to the ranks of Major during his racing career. His extreme fitness combined with team tactics made him a fearsome competitor.