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With power typically being the product of force and speed, a motorcycle's power and torque ratings will be highly indicative of its performance. Reported numbers for power and torque may however vary from one source to another due to inconsistencies in how testing equipment is calibrated, the method of using that equipment, the conditions during the test, and particularly the location that ...
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
Harley-Davidson has used various ignition systems, including the early points and condenser system on Big Twins and Sportsters up to 1978, a magneto ignition system used on some 1958 to 1969 Sportsters, an early electronic with centrifugal mechanical advance weights on all models from mid-1978 until 1979, and a later electronic with a ...
Harley-Davidson Shovelhead engine at the Harley-Davidson Museum. The Shovelhead engine is a motorcycle engine that was produced by Harley-Davidson from 1966 to 1984, built as a successor to the previous Panhead engine. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and ...
The Evolution Big Twin saw a fifteen-year run in Harley-Davidson's Dyna, Softail, FXR, and Touring frames, although a limited number of Evolutions were used in the 2000 model year CVO FXR4, and 1999 FXR2 and FXR3 models. While the main case was only slightly modified from the previous Shovelhead engine, the top end was significantly improved.
Harley-Davidson was slow to capitalize on this demand, finally introducing the Sportster XR-1000 street bike for the 1983 model year, 13 years after the XR-750 racer. The XR-1000 used XR-750 heads, but kept the Sportster engine, frame and other equipment. [ 10 ]