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Sportster motorcycles are powered by a four-stroke, 45° V-twin engine in which both connecting rods, of the "fork and blade" or "knife & fork" design, share a common crank pin. The original Sportster engine was the Ironhead engine, which was replaced with the Evolution engine in 1986.
The ironhead was a Harley-Davidson motorcycle engine, so named because of the composition of the cylinder heads (Iron instead of Aluminium). The engine is a two-cylinder, two valves per cylinder, pushrod V-twin .
Harley-Davidson engines are a line of engines manufactured since 1903 in Milwaukee, Wisconsin by the Harley-Davidson company for use in its motorcycles.Harley-Davidson engines are now made at Harley-Davidson Motor Company's Pilgrim Road Powertrain Operations facility in Menomonee Falls, Wisconsin.
The first year of the new Sportster to have the Evolution overhead-valve engine, alloy heads XL883N, Iron: 53.9 cu in (883 cc) 2009–2022 A "baby" version of the popular 73 cu in (1,200 cc) Nightster, it comes with more black and cast wheels. XR1200(X), 73 cu in (1,200 cc) 2008–2010, 2011–2012 for X series
Also available in the Sportster model beginning in 1986, it was made in the 1,100 cc (67 cu in) displacement until 1988 and is still made in the 883 cc (53.9 cu in) and 1,200 cc (73 cu in) [1] displacements for the Harley-Davidson Sportster, replacing the ironhead Sportster engine.
Lindsay, Brooke (November 5, 2006), "Harley's Sportster: From a Wild Child to a Grown-Up in 50 Years", The New York Times As grim as those days were in terms of performance, it was an era that produced two of the Sportsters considered most unusual and sought-after by collectors, the 1977-78 XLCR Cafe Racer and the 1983-85 XR1000. Both of these ...
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