Originally Posted by K7MDL
Take a good look at your reed valve cover next to the lower end of your cam chain. Double check by looking at your cam chain tensioner, might be 10 or 11 clicks out by now. The cam chain acts as a chain saw and grinds off the reed valve and cover edge, and one of the screws for it. It can also take out some aluminum with it.
Thank you K7MDL. I'll take a look at the tensioner and if the chain is wearing against anything. There was no unusual engine noise though (like I've heard on other bikes with loose cam chains) and the metal in the oil is magnetic.
KTM 625 SMC, KTM 300 XC-W, '04 CR500 AF supermoto
, XR100 minimoto, '09 GSX-R 600 track