Head Configuration

The head on all bikes except Super Motard must remain in stock configuration. The head can be ported and polished, the valves can be resized, but if the bike came with only 2 valves it may not be changed to a 4 valve head. This is to help keep the cost down and the competition closer. It is also a safety issue in that the younger riders in the F1 and F2 classes do not need to be on the track with CRF50's that are able to out power a 150.