Everyone knows Harley-Davidson as one of the premiere motorcycle brands, but the company hasn’t had smoothest of rides. The Great Depression hit the motorcycle industry hard, with sales plummeting across the board. Harley-Davidson was one of the companies that lived long enough to see the light at the end of the tunnel, and that’s all because of the El Knucklehead. Engineered by the man himself, William Harley, the Knucklehead was a revolutionary powerhouse. It was a twin-cylinder, overhead valve
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