[Ghostyman]

Originally Posted by BigD_83

That is a lock pin to something, and looks pretty large, so it shouldn't be an internal part. Looks familiar, and similar to Part #8 in this diagram of a footpeg, but the base looks to be the wrong shape...

http://www.2wheelpros.com/oem-parts/...-assembly.html

Good call. It's not that, and it's not the lock pin for the rear braker lever to the master cylinder. It is the same dimensions as the lock pin for the rear brake but has a thicker base (and the base is shaped a bit different, as you noted). It also doesn't have any visible wear marks on it so it never got moved much.