By 1937, all Harley-Davidson flathead engines had been equipped with dry-sump oil recirculation units comparable to the one released within the "Knucklehead" OHV motor. six. Harley-Davidson reserves the right to amend the terms in the Promotion or to withdraw the Marketing at any time if conditions outside of its https://harleydavidson99999.bloggerswise.com/38117225/harley-davidson-fundamentals-explained