just tore down the top end,the piston has a lot of bad scoring on the exhast side.on the top of my piston is stamped 1.00mm below that is 573P4 below that is CD and at the very top A9014. I know i need to replace the piston and reboar , how can i tell if my crank bearings are gone? All due to my daughter riding my blaster and possibly over revving. Can somebody please help me? Thanks
