6. Riders who have ever been classified as a Pro, Pro Am, or “A” rider in a non-youth class, are not eligible for any “B/C” designated class.
Pro, Pro Am, or “A” riders granted AMA reclassification may not compete in the “B/C” class in the national program.
This is a big change for 2013, not letting people drop back down to B/C
Guess they got tired of looking for the holeshot devices which are now legal in the limited (stock) classes