Yoshimura Suzuki Racing is proud to announce the signing of famed Supercross and Motocross Champion, James Stewart, to a multi-year contract effective immediately. Stewart will compete in both AMA Pro Motocross and Supercross aboard the Yoshimura Suzuki RM-Z450 beginning with the first round of the 2012 AMA Pro Motocross Championship in Sacramento, CA on May 19th, 2012