1928 - 1942 Indian Four-cylinder motorcycles were a top-end luxury in the 1920s and 30s, and the Indian Four was built as such from 1927 until production ended in 1942. The Indian Four was a motorcycle built by the Indian Motocycle Company from 1928 to 1942. It was based on the Ace motorcycle, which Indian bought as part of the assets of the Ace Motor Corporation in 1927. For 1940, the Four frame was modified to include plunger rear suspension. In the same year, all Indian models were restyled w