Riley entered a pair of IMCA Modified events over the weekend, Friday at Marshalltown and Saturday at Boone.
Friday night, he ran fifth in his heat race and then started 15th in the night's feature, but suffered a DNF, ending his night early.
Saturday, at Boone, he ran second in his heat race and then charged from 10th up to 5th in the night's feature event for a top five finish.