1940 Harley-Davidson U.A. Back to contest Vote Description 1940 Harley-Davidson U.A. The UA, built only in 1939-1940, had an extra-low-compression 74 c.i. side-valve engine that made 34 hp. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Δ Share OK More