Repeat winners and first time victors at California Prokart Challenge Repeat winners and first time victors at California Prokart Challenge Second event of season at Buttonwillow provides excitement to complete first third of championship chase Bas Kaligis / Friday, May 12, 2023 0 663 Article rating: No rating The second event of the 2023 California ProKart Challenge saw teams and drivers return to the Buttonwillow Raceway Park over the May 6-7 weekend. Round Two of the Superkarts! USA regional program welcomed nearly 100 karters competing in seven categories around the 7/10-mile circuit in the clockwise direction. Perfect racing weather provided an amazing backdrop for the racing action over the two days. Read more