Just set the valve lash and am in the process of replacing the cams. According to the book, the exhaust cam should be in a certain position with the cam chain pulled tight. When I do this, the chain is exactly on half link (one tooth) off. However, if I correct for the tooth, then the chain is again, one half link off. It's as if the cam chain is one half link too long. If I place the exhaust cam sprocket timing mark where the book says it needs to go, with the pin count as the book says, the crank is no longer at TDC. Very difficult to articulate what is going on, but I can't seem to get it in the correct position. Looking for an idea.