I have recently, through no action of my own that I remember, started receiving emails when anything is posted in the 1972-73 Twin Shocks category.  I am very interested in this category as I have an AT3. However, I am receiving 20-30 emails a day for every update to every topic.

Can someone please tell me how I turn this off.  The Help page tells me there is a Category Subscribe/Unsubscribe option but I'll be damned if I can find it.

You should be unsubscribed from the category. Sorry about that. It was a setting error. See related thread from me.