X Series Sportsters
- XL, Ironhead, 1957–1984: 883 cc and 1,000 cc Ironhead overhead-valve engines with cast iron heads, K series frame
- XR-750 (racing only) 1970–1971: 750 cc overhead-valve engine, iron heads
- XR-750 (racing only) 1972–1985: 750 cc overhead-valve engine, alloy heads
- XLCR 1977–1978: Cafe racer 1,000 cc overhead-valve engine, iron heads
- XR-1000 1983–1984: 1,000 cc street model using XR racing cylinder head and other XR engine parts.
- XLR: 883 cc overhead-valve engines, iron heads
- XL, Evolution (also known as the "Evo"), since 1986: 883 cc, 1,100 cc and 1,200 cc Evolution overhead-valve engine, alloy heads
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