OK...after adjusting my powervalve as discussed in this thread twice and still having a very loud rattle on decel, I think I found the answer. My bike doesn't rattle any more. Sweet! Please review the videos below and let me know if there is a better way to keep the bellcrank from hitting the case. I can't change the length of the push rod but maybe some of you have a better or easier idea of fixing this.
Video 1 (making the adjustment):
http://www.youtube.com/watch?v=dI0fU...2UwnDw&index=2
Video 2 (bike running before and after):
http://www.youtube.com/watch?v=YGjVW...2UwnDw&index=1