Model K Series
This is developed from the earlier 45 W model, but with the revised flat head engine and new 4-speed transmission contained in the same castings as would become the Sportster. The connecting rods would be inherited by the Sportster along with many other design features and dimensions.
- Model K and KK 1952–1953: 750 cc side-valve engines, using the 45 model bore and stroke
- Model KR (racing only) 1953–1969: 750 cc side-valve engines
- Model KH and KHK 1954–1956: 885 cc side-valve engines, using the 45 model bore, but with the stroke increased to 4.5625" (115.89 mm). This is the only small twin with a longer stroke than 3.8125", which is otherwise universal to the entire 45/K/Sportster line from 1929 to the present (exception: XR750, XB9 Buell).
Read more about this topic: Harley-Davidson Sportster
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