I am wondering which bike to buy for my son. He is 6 and is over jumping a 6' double that I made him on his jr 50 and holding on for all he is worth as the suspension rebounds in his face. I am looking at a new Pro Jr or a used X1. I understand that the X1 has better suspension but I wonder just how important at this level of competion and ridding this is realy worth. He races at local tracks and is getting beat down the straights. I am looking for some advise on which bike to buy. I will be getting him one by the end of the month. I am leaning to the KTM... He has sat on a Pro Sr and can touch the ground with 1 foot. Also if any one knows what the Hp ratings are on either of these bikes are also... Thanks, Jason