Quote:
Originally Posted by porschetub
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+1
when the carbon is washed away from the top edge of the piston it is a sign of worn oil control rings and usually the compression rings will be worn also.
Raw fuel, from no ignition (bad plug, ignition wire, to much fuel etc.) will wash the lubrication oil from the cylinder walls and wear out rings fast.
You had fuel issues which accelerated the ring wear.