Hey, Ive got an 89 wr500. I was out riding it yesterday and it was doing fine.i came back to the dock shut it off for a min and turned it back on. It started up just fine but it would hardly move. If i gave it more then about 1/4 of the throttle it would just rev up and not even try to move. When i took it home i looked under it thinking maybe there was a bunch of stuff in the grate. There was nothing in there but on the driveshaft there where 2 rings almost like a broken bearing or oil seal just hanging around it. You can tell they are broken and i can move them back and forth freely. what are these? any help would be greatly appreciated thanks.