Engineer, the stock plunger was out 19mm from the body to the shoulder. I figured I had about 2 more "clicks" on the thing before it went kerfluey...
I figured I had plenty of time but I sometimes ride hard and the bike had 2 PO's before me. I was actually kinda surprised at how far out it was considering it only had 11,000 miles.
I figure now I can go until it's starts rattling around in there and then when I buy a replacement cam chain I'll invest in a bore, piston and performance cam...