<Table> <Tr> <Td> </Td> <Td> This article possibly contains original research . Please improve it by verifying the claims made and adding inline citations . Statements consisting only of original research should be removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article possibly contains original research . Please improve it by verifying the claims made and adding inline citations . Statements consisting only of original research should be removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> The Evolution engine (popularly known as Evo) is an air - cooled, 45 - degree, V - twin engine manufactured from 1984 by Harley - Davidson for the company's motorcycles . It was made in the 1,340 cc (82 cu in) displacement for Harley - Davidson Big V - twins bikes, replacing the Shovelhead engine until 2000 when the last EVO was placed in a production factory custom FXR4 (FXR2 and FXR3 were the first CVOs). In 1999, it was replaced by the Harley - Davidson Twin Cam 88 in the Touring and Dyna model and in 2000 in the Softail models . 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) displacements for the Harley - Davidson Sportster, replacing the ironhead Sportster engine . </P> <P> Most analysts consider the Evolution to be the engine that saved the reorganized Harley - Davidson company from certain bankruptcy . Harley - Davidson's official name for the engine was likely related to the company's attempt to reform its image following the 1981 management buyout from previous owner American Machine and Foundry (AMF). </P>

When did harley davidson introduced the evo motor