Every year I make a major comittment to tearing down my bike and rebuilding it. And it seems that every year that I do the rings are seized up in my piston. Now I run Wiseco Pro-Lite pistons every time I rebuild it and I take all the care in the world when breaking it in. I'm not sure what could be causeing the rings to seize up like this in the ring grooves. Maybe getting too hot? I did have a cracked head and all the previous pistons including the current have been run with the cracked head in place although i now have a new head. maybe the piston expanded too far and locked the rings in the grooves. I think that the rings should still be loose in the grooves when you tear it down after a year of riding? right? I ride a lot during the summer, maybe i'm not replacing rings often enough? I don't know but this is starting to make be wonder about my motor. I have put a lot of money into it over the years. new cylinder, new head, new crank, all new gaskets and seals. just don't understand it.