Well this may not apply in your case but i have added penetrating oil to closed cylindersand then a spark plug adapter and an air compressor to force penetrating oil in. I guess I’m not a patient man, just a thought.
“Which one to tap?”— I have a Johnson A-25 that is stuck but i can look into the exhaust ports and see one piston move slightly when i rock the flywheel. The other one is stuck Just another thought. Jim
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This reply was modified 4 years, 3 months ago by 2fast4me. Reason: Added info