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A Dirtster is a Harley Davidson Sportster motorcycle customized for dual-sport riding (on paved and unpaved roads). The original inspiration for this style of custom motorcycle was probably Harley Davidson's XR750 dirt track racing motorcycle. Dirt track racing is like oval stock car racing... with motorcycles... on dirt. That said, the typical dirtster usually looks not at all like an XR750. Dual sport motorcycles that do look like XR750s are known as street trackers.
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