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Mirror smooth cylinder walls aren’t necessarily a good thing. Honing leaves microscopic grooves to trap oil which helps lube and seal the cylinders to the pistons skirts.
I agree, please do not pull that powerhead down to hone the cylinders. Don’t be afraid to go a little more coarse than 600 grit, these engines are not fussy, the dust/grit can be blown out/cleaned out with carb cleaner.
Mix the oil a little heavier on start up and use the sea foam/engine tuner to free up a partially stuck ring situation that might be present.
After using it a few times, be sure to fog it down good, and pull the drain plug on the carb to preserve this nice outboard time capsule!