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Any luck the removing the offending cylinder/piston? If the engine is on a stand, I would suggest rotating so the cylinder is on top and then soaking from above with pb blaster. Use a brush to clear any debris from the two of piston/cylinder to let the PB work. If you're in no rush, let it set as long as needed. I prefer to use wood blocks for driving softer metal. I've seen frozen engines clean up surprisingly well once freed and honed. There's an outside chance you'll get lucky still.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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