I set out to replace my rings tonight. I have 2000 miles on an 04 rev 800 and wanted to get it done just for piece of mind. I pulled the head and on the mag side, I found what looked like a ring had broke and done some damage to the head and piston. It dosent look like it did a lot of damage, but how much is to much to salvage the head? I pulled the rings and of coarse they are pitted but not broken. The reeds look fine also. What else could have caused this? I will add photos in the morning. Will I be able to reuse the head if it has minor damage?