OMG. Thank you! This happened to me a few months ago. Crashed, throttle jammed, over-revved engine. Wouldn’t restart after picking up bike. Didn’t have the mental energy to troubleshoot the problem. After seeing this post I pulled flywheel. Sheared off as suggested. Thanks, will order a new woodruff key. Any suggestions on preventing it from happening again? Want to assure my riding group they won’t have to tow me back out of the trails for the same problem! Thanks again!