1928
Indian 401 | Engine no: A1313 | Indian purchased the Ace Motor Corporation in 1927 and moved production of the 4-cylinder Ace motorcycle to Springfield and marketed it as the Indian Ace for the rest of that year.
In 1928, the Indian Ace was replaced by the Indian 401, a development of the Ace designed by Arthur O. Lemon, In 1929, the Indian 401 was replaced by the Indian 402 which received a stronger twin-downtube frame based on the 101 Scout frame and a sturdier five-bearing. Thus, the Indian 401 had a very short existence as when the Ace engine was fitted in the Indian frame a vibration appeared that was not present when the Ace engine was in the Ace frame.