After returning to Taloyoak, he later moved to Cambridge Bay. In 1975, he was elected to the NWT Legislature. He ran again in the 1979 election, as did his younger brother Bobby Lyall, but the election was won by Kane Tologanak.[1]
In 1978, Lyall was elected president of the Ikaluktutiak Co-op in Cambridge Bay. By 1993, he had helped the Co-op grow from $300,000 in assets to $2.3 million. Later in the 1970s he became a director of Canadian Arctic Producers, a native owned arts and crafts wholesaler. In 1981, he helped form the Arctic Co-operatives Limited, a merger between the Canadian Arctic Co-operative Federation and Canadian Arctic Producers.[3] He was the vice-president and president of the Arctic Cooperative, a position he has held for several years, and represented the communities of Kugluktuk, Cambridge Bay, Gjoa Haven, Taloyoak, Kugaaruk (all in Nunavut) and Ulukhaktok (Northwest Territories).[4]