Ok I did that oiled it and sanded it. It had no low spots but when I hooked everything else up and tightened the chain the clutch is not engaging. I can pedal with no resistance with the clutch engages or not. Could this be something loose or the clutch isn’t properly adjusted?
Now that it's running do several short 2-3 miles runs letting it cool between rides, check the spark plug color, the white porcelain part should be brown. You probably had a air leak that caused the over heating and piston failure.