Discovery Channel is sending us back in time to the beginning of what evolved into one of America’s most well-known motorcycle brands: the Harley-Davidson Motor Co. A mini-series, “Harley and the Davidsons,” includes three two-hour installments. Part 1 will air at 9 p.m. ET on Sept. 5. Parts two and three air on Sept. 6, and Sept. 7. The story provides insight into the successes and struggles of company founders, Walter and Arthur Davidson and Bill Harley.