Harley Davidson SportsterHarley-Davidson Sportster is the longest continually produces motorcycles in the HD lineup. Harley Sportster XL first, with 55 cubic inch, four-stroke engine and four-speed transmission, introduced in 1957. He replaces K Flathead Harley motorcycle and was built in response to Japanese and British bikes are flooding the U.S. market at the time.The next year, HD Sportster XLH introduced with higher compression and larger valves....
