Harley-Davidson’s new Screamin’ Eagle Stage IV kits for 2017 and newer Touring platforms carry the tagline “Go Big or Go Home.”

And for a good reason. The Milwaukee-Eight platforms grow substantially with these Stage IV kits, the 107CI growing to 128CI (2097cc), and the 114 and 117 to 131CI (2146cc).
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https://ultimatemotorcycling.com/2020/03/27/harley-screamin-eagle-128-131-stage-iv-kits-released-121-horsepower/