James Stewart is out for the rest of the 2010 AMA Pro Motocross series, due to ongoing problems with a longstanding wrist injury.
Bubba returned to the race track at Unadilla recently, but following a week of training and testing since then, Stewart and his team have withdrawn. His next scheduled appearance will be the Anaheim Supercross in January 2011.
A disappointed Stewart explained: "At this point, I honestly just hope my fans will understand. I said before that I wanted to be on the track starting with Hangtown, but the slow healing nature of my wrist injury made it impossible to do so.
"Watching race after race and not being a part of the series has been very difficult. All along my motivation was to get back to racing and return to the outdoor series for my fans and sponsors. And though my wrist is feeling great, it became obvious that I'm just not ready to race at that level yet.
"As much as I'd like to be out there, I need more time to prepare so that I don't put my entire career at risk by getting injured again. I'd like to apologize to my fans first and foremost, as well as to the series and my sponsors for being unable to continue."