Random Info on the XR750
___________________________________________________________
"Harley Davidson's XR-750 has been the undisputed king of the dirt track circuit for three decades, winning more races than any other machine. The XR-750, developed in 1970 to replace the Flathead KR, continues to rule the track to this day and is the favorite of many riders."
From an article by Bob Feather, May 2000 American Iron Magazine.
___________________________________________________________
"Introduced in 1970 to replace the aging flathead-powered KR-750, the XR-750 carried Harley's competition banner to numerous dirt-track wins during the decade. Based on the Sportster V-twin, the engine originally carried iron cylinders and heads, which were replaced by aluminum components n 1972. At the same time, exhaust pipes, which at first exited low to the right side of the bike, were routed so that they exited high on the left side. In both cases the rear cylinder's intake and exhaust valves switched positions from normal practice. Dual Mikuni carburetors fed the V-twin, and a mere quarter-turn of the throttle would raise their slides from idle position to wide open - at which point the rider was holding the reins on 90 thrashing horsepower. Not until the Japanese entered dirt-track racing with more sophisticated machinery late in the decade did the XR-750 fade from glory."
Taken from "Harley-Davidson Chronicle" by Doug Mitchel. Publications International, 1997
___________________________________________________________
_________________________________________________________