thicker sprocket nut worth a check

[fazersharp]

Yes it just has an extra few threads. Maybe its the few extra threads that keeps it on but more likely its the ability to go to 90Nm that does it.
You should be able to tell if you have the deeper nut as the 9mm one finishes with just about 1 1/2 shaft thread showing and the 12mm finishes flush with the end of the shaft with no thread showing.

I have a 98 and I should add that I do trust the 9mm nut and keep an eye on it and an ear out for it and I have the 12mm nut ready to fit and will use the 12mm when I change the sprocket

More malarky here http://foc-u.co.uk/index.php/topic,19504...#msg225613
And here
http://foc-u.co.uk/index.php/topic,17632.0.html
I can see mine from underneath the bike as I cleaned out the gunk not long ago, you can see the thread and the tab see the picture below chain in the forground and on the right
[img height=624 width=597]http://foc-u.co.uk/index.php?action=dlattach;topic=19958.0;attach=24542;image[/img]


9mm nut as per yam factory