There is a video of Jack racing motocross at Motosports Park in Byron Illinois in 1974 on the 1617MX Facebook page for anyone interested. You can look it up under videos on the 1617MX Facebook page and search for Jack Penton - I don't know how to link it here. He is number 21 with the skunk stripe helmet on. I was 14 years old racing C class on a Honda CR 125 on that day and not in the video!