1957 Harley-Davidson KR Back to contest Vote Description 1957 Harley-Davidson KR Used in both road and dirt track racing, the KR was one of the most dominant production racers of its era. The 45 c.i. (750cc) V-twin makes 42 hp. This example campaigned in the 1960s by Tom Allen of Atlanta. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ Share OK More