My Son and I watch the video several times. The head gasket is blowed and causing the ticking sound. When the motor revs up you can see the smoke come out the front of the motor towards the muffler.
Did you measure the crank and rod journal when you removed the piston?
What was the measurement and what tool did you use to measure it?
Best thing to do is take it to an automotive machine shop that has the correct tools to measure it.
I have two K321s with cylinder resleeve. Both are strong runners.
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