Stewart is filling in for injured rider Justin Bogle on the JGR Autotrader/Yoshimura Suzuki team. After missing out on Anaheim 1, he has raced the 450 class for the Houston and Anaheim 2 rounds. He is 11th overall in the 450SX standings. He scored an 11th in the Houston round and in the Triple Crown structure picked up a 16, 8, and 14 place finishes. Stewart was the 2016 250SX East Regional Champion and scored a 15th overall in his rookie year in the 450SX class after missing the first two rounds of 2017.