View source for Harley-Davidson U

By 1937, all Harley-Davidson's [[flathead]] [[engines]] were equipped with [[dry-sump]] oil recirculation systems similar to the one introduced in the "[[Knucklehead]]" [[OHV]] engine. The revised 74 cubic inches (1,210 cc) [[Harley-Davidson V|V]] and [[Harley-Davidson VL|VL]] models were renamed [[Harley-Davidson U|U]] and [[Harley-Davidson UL|UL]], the 80 cubic inches (1,300 cc) [[Harley-Davidson VH|VH]] and [[Harley-Davidson VLH|VLH]] to be renamed [[Harley-Davidson UH|UH]] and [[Harley-Davidson ULH|ULH]].  The 74" U & UL flathead models were produced up to 1948, effectively having been replaced by the 74 cubic inches (1,210 cc) "[[Knucklehead]]"s that were introduced in 1941 as the [[Harley-Davidson F|F]] and the [[Harley-Davidson FL|FL]].<ref name=Chronicle>{{cite book|author=Mitchel, D.|title=Harley-Davidson Chronicle - An American Original|pages=94-95|publisher=Publications International Limited|year=1997|isbn=0-7853-2514-X}}</ref>  


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[[Category:Harley-Davidson motorcycles]]