While you have things apart would be an excellent time to get inside of the transmission and find out if you have one of the infamous circlip transmissions.
The circlip is definitely on my longterm list, along with a higher fifth and bearing replacement. Thanks for the pics and the links, now I actually understand what that 'circlip' problem is!
I've talked to Nathan at Boxerworks about it. Since the bike only has 18,000 miles on it he said I could probably wait, but that he could do it. I'd have taken it by already but he doesn't have any higher fifths in right now(dang HPN!) and I'd rather be riding. It's really only an afternoon job to pull the tranny.
Here's what happens when you hit a bee at 50mph