I changed counter shaft sprockets recently and after torquing the nut I forgot to bend the washer tab over the edge of the nut . I rode this way for about 4 or 5 rides. On a dual sport ride I decided to pull over to take a picture (so lucky I did this) and noticed oil all over the engine, chain, swing arm, everywhere. I quickly realized that the counter shaft nut was loose and I had never bent the washer tab. This allowed the counter shaft sprocket to move side to side and I believe allowed dirt to enter the seal and cause the major leak. Once I got the bike home I ordered a new seal, I'm in the process of installing the new seal now but I'm wondering about the counter shaft play (in/out), should there be any? Right now there is less than half a mm of movement in and out and I can't remember if that much existed previously. Granted it's not much movement but it doesn't feel good as it clicks back and forth. I'm guessing it's fine but I'm feeling a little paranoid I guess. Does anyone know the answer to this? I'm concerned that the loose sprocket may have caused some internal damage. If I don't get any replies I'll just put it back together, ride it, and see what happens Thanks for any help.