MOORESVILLE, N.C. (Jan. 17, 2014) – Byron Racing photo – JR Motorsports announced today it has signed 16-year-old William Byron, a legends series national champion, to compete regionally for Dale Earnhardt Jr.’s late model program, which enters its 13th season competing at tracks across the southeast. The addition of Byron cements the JR Motorsports late model driver line-up for 2014, which includes …