en.wikipedia.org/wiki/Harley-Davidson_Sportster
The Sportster is a line of motorcycles produced continuously since 1957 by the Harley-Davidson Motor Company. Sportster models are designated in Harley-Davidson's product code by beginning with "XL"
Construction
The original Sportster engine was the Ironhead engine, which was replaced with the Evolution engine in 1986.
Significant changes by model year
· 1957 "Ironhead" overhead-valve engine introduced.
· 1972 "Ironhead" 1,000 cc overhead-valve engine replaces 900 cc.
· 1985 Last year for the "Ironhead" overhead-valve engine.
· 1986 "Evolution" engine introduced in 883 cc and 1,100 cc sizes.
· 1988 1200 cc engine replaces 1,100 cc engine.
· 1991 Belt drive replaces chain drive on 883 Deluxe and all 1200 models.
· 1993 Belt drive made standard on all Sportsters.
· 2003 Last year for the frame mounted Evolution engine.
· 2004 All-new frame including rubber-mounted engine for decreased vibration.
· 2007 Fuel injection replaces carburetion on all models.
en.wikipedia.org/wiki/Harley-Davidson_Sportster
The Sportster is a line of motorcycles produced continuously since 1957 by the Harley-Davidson Motor Company. Sportster models are designated in Harley-Davidson's product code by beginning with "XL"
Construction
The original Sportster engine was the Ironhead engine, which was replaced with the Evolution engine in 1986.
Significant changes by model year
· 1957 "Ironhead" overhead-valve engine introduced.
· 1972 "Ironhead" 1,000 cc overhead-valve engine replaces 900 cc.
· 1985 Last year for the "Ironhead" overhead-valve engine.
· 1986 "Evolution" engine introduced in 883 cc and 1,100 cc sizes.
· 1988 1200 cc engine replaces 1,100 cc engine.
· 1991 Belt drive replaces chain drive on 883 Deluxe and all 1200 models.
· 1993 Belt drive made standard on all Sportsters.
· 2003 Last year for the frame mounted Evolution engine.
· 2004 All-new frame including rubber-mounted engine for decreased vibration.
· 2007 Fuel injection replaces carburetion on all models.
I didn't know wikipedia was an official publication of the Harley-Davidson Motor Company.
Thanks for proving my point, nobody including H-D referred to any Sportster as an "Ironhead" until H-D made the EVO Sporty.