![]() ![]() Harley-Davidson’s dogged development of the old flathead design was simply remarkable, and the KR750 held its own on the track against supposedly superior machinery. By the final year of production for the road-racing KR model (the 1969 KRTT), it was timed at 150 MPH on Daytona’s banking. While AMA rules for Class C racing favored the homebuilt 750cc flathead motor, which was pitted against 500cc OHV singles and twins, that didn’t mean the side-valve motor was as retrograde as some would think. The KR750 was the racing version of the roadster Model K, destined for glory on America’s flat tracks. With full suspension front and rear, a unit-construction motor, modest weight, footshift/hand controls and clean styling, the K was clearly intended to address foreign competition in the U.S. When it was introduced in 1952, the Model K was as radical a machine for Harley-Davidson, as the Knucklehead had been in 1936, and it was a fully modern motorcycle. The Harley-Davidson KR750 racer was the winningest motorcycle in America for 17 years, up until it was superseded by the XR750 in 1970, which is still winning races today.
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