Interestingly, when this Ironhead Sportster motor went down the line at Harley-Davidson’s Engine Plant in Milwaukee some time in 1967, carbon fiber hardly existed. Sure, it was back in the 1950s that the first carbon fibers were developed for use on missiles, but they were primitive compared with today’s product. And it wasn’t until the 1970s that today’s carbon fiber composites began to be refined to the point where they became suitable for a wide range of uses.
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