Even for Harley-Davidson, which is one of the best known motorcycle makers in the world - this one, literally is a ‘revolution’ of sorts. The Street 750 motorcycle, unveiled at the EICMA (Milan) motorcycle show, features the all-new Revolution X Engines from the bike maker. In addition to the new engine, which for the first time on a Harley boasts liquid cooling; the motorcycle will also feature Dark Custom styling language from the Milwaukee-based motorcycle maker.