Just rolled over 10K on my 2007 Burgman 650. I bought it last year (2013) with only 2,300 miles. Just to be safe, I replaced the original CVT stopper bolt with a new one at 4K miles. It had only a small indentation (see photos below). Replaced with new 21749-10G10 part at 4K miles so the current one had 6K miles on it.
I've read where some Burgman owners have had their stopper bolts chewed up in less than 10K miles, but mine seems to be doing OK.
Original (replaced at 4K miles) and current one (at 10K miles: 6K miles of usage)
Original showed minor discoloration on one side at 4K miles.
Original had small indentation at 4K miles. Doesn't look serious enough to worry about, but I replaced it anyway since the new one is only $5.
Close-up of original at 4K miles.
Another view of original at 4K miles.
Current stopper bolt (new 21748-10G10 part #) with 6K miles of usage.
Another view of current stopper bolt with 6K miles of usage.
New one to be installed. I won't worry about checking this one for 10K miles or so.