Harley-Davidson KR
... in post-World War II United States, the Harley-Davidson KR dominated domestic motorcycle racing with an obsolete but highly refined flathead engine?
... in post-World War II United States, the <b id="mwAQI"><a href="./Harley-Davidson_KR" id="mwAQM" rel="mw:WikiLink" title="Harley-Davidson KR">Harley-Davidson KR</a></b> <i id="mwAQQ">(pictured)</i> dominated domestic <a href="./Motorcycle_racing" id="mwAQU" rel="mw:WikiLink" title="Motorcycle racing">motorcycle racing</a> with an obsolete but highly refined <a href="./Flathead_engine" id="mwAQY" rel="mw:WikiLink" title="Flathead engine">flathead engine</a>?