Point Doc, I forgot to ask where you got the aluminum sprocket from. Also, I have an XB9 not an XB12 so is there an alternative sprocket for me with a lower tooth count?
Sidenote: Did any of you realize that the primary chain is a glorified bicycle chain? You can get a Chain replacement kit, it comes with a tool for taking out links and adding them. Simple stuff really. Instead of buying a new chain you can just shorten the one you have, or buy a new one and shorten them both so you have a spare just in case Murphy's Law attacks. Any comments/criticisms for that idea?