Racer X Motocross Show: Southwick June 30, 2013 1:40pm Home Racer X Motocross Show Racer X Motocross Show: Southwick Southwick, MA Southwick AMA Pro Motocross Championship Watch on as Jason Weigandt takes you through round six of the Lucas Oil Pro Motocross Championship from Moto-X 338 at Southwick for the final running of this amazing event.