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Not particularly for outboards, but I have heard that a mix between some sort of cleaner and diesel or something along those lines works well. I would try some sort of chemical mixture as long as you are doing a cosmetic restoration. I will ask some of my friends that are more “gear heads” than I am to see what the particular mixture was.
"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."
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A lot depends on how much of a hurry you are in. If no hurry, repeated soaking alternating with heat cycles may free the piston. with no damage. As for the “grease gun” this works best if the piston is stuck up near the top of the cylinder where no ports are open. One will need a custom made fitting… grease gun Zirk into a spark plug body.
With the slow soak method it’s helpful if the spark plug hole is inline with the cylinder, thus allowing inscrtion of a wood dowel and tapping the piston to get movement.
Your favorite “soak” penetrant oil or ATF fluid.
Joe B
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I tried grease gun & compressed air, but this was the only way I could get this one out. Video link – https://youtu.be/QcAwNp0mzRs?si=_36E59BBRauigDdN
A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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