i was riding today, it was bogging down at wot , i was opening it up slow it would be alright i am still working on jetting issues, i put it trailer went home, rolled it off the trailer , i kick started it , it was like a loud squeeking sound, i shutt it right away, i took the head off and jug, it look all ok no scratches and rings seem fine. what else, or how to check the rings.