After cleaning and close inspection yesterday, I found a spiral burr in the cylinder emerging under the piston.. My guess is, broken ring(s), and new scratches of the the cylinder are the culprit for the lack of compression...
Definitely the time for new lawn mover.
I am thinking of electric one (Bunnings, 1.5kW, 240VAC, $150), my lawn is not that big so this machine should do.
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