I posted earlier about a seized motor. I was able to get the motor to turn freely after some lubrication. There is a couple of dings in the top of a piston and a couple of pieces of a ring inbedded in the head. The cylinder wall has a couple of small scratches, no more than .010 deep. The previous owner ran cheap oil in it, so this is not a suprise. How difficult is is to remove the piston and replace it. I want to do a decent job, but not spend a fortune. I know there is carbon under the other rings that needs to come out, will repeated decarbing with engine tuner or sea foam remove enough carbon to avoid a complete rebuild. The other cylinder walls look great.