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History of the Ironhead Motor
The ironhead motor was a small Harley V-twin used primarily to power Sportsters. The ironhead was available in two different sizes, depending on model year:
- 1957-1971: 900cc
- 1971-1985: 1000cc
The ironhead was replaced in 1986 by the Evolution engine, available in the Sportster in 883cc, 1100cc, and finally 1200cc variants. The motor has since become a favorite platform for Ironhead choppers and bobbers.