Originally Posted by DougZ73
I assume you mean countershaft "nut"???To remove front sprocket??
No, cotter pin or circlip..the nut is "peened" in one spot, where there is no threads. You have to bend out this peended spot, and the nut should come off with a breaker bar.
Some guys have just used an impact gun to remove the nut, although I would not recommend this to anyone, since thread damage could occur.
I have removed it before without bending out the peened in spots. I don't think they add a lot of resistance to loosening the nut. Having a friend hold the rear brake or being in a higher gear helps.