Remove the piston pin and remove the piston.
Place a clean shop towel over the crankcase to prevent the clip from falling into the crankcase.
If you plan to reuse the piston, mark the piston with the cylinder and proper direction after removal so it can be placed back in it's original location.
Remove the oil jet from the crankcase.
Check the oil jet for clogs.
Remove the O-ring from the oil jet.
Inspect the piston rings for smooth movement by rotating the rings. The rings should be able to move in their grooves without catching.
Spread each piston ring and remove it by lifting it up at a point just opposite the gap.
Do not damage the piston ring by spreading the ends too far.
Clean carbon deposits from the piston ring grooves.
Clean carbon deposits from the ring grooves with a ring that will be discarded Never use a wire brush, it will scratch the groove.