The 8 bolts hold the piece on each side that the bolt goes through.I have had mine off without issue. The main engine support is not associated with the crash bars. In the picture below the main engine support is the open hole in the center, if I am not mistaken, It is a through bolt from side to side. It is removed in this picture as the bike had sliders installed which had to be removed for crash bar installation. I did not have the original bolt and was waiting for a replacement.