04873 Main pulley 80 teeth LOGO 690 SX

I recently upgraded my 600SE to 690SX spec. This part is required in order to use the new, thicker OWB hub. But, beware that you'll have to cut the back off of the 600SE aluminum motor mount in order to fit it in to place. 5 minutes with a hacksaw took care of the issue. (5 more minutes polishing it back smooth if you're picky, like me) and it fits like a charm.