I think this will qualify for DIY. I have an old 1991 Honda CR125 dirtbike that
I found in a barn. It has been sitting there for at least 20 years. Other than
being very dusty, the engine is stuck. I have pulled the spark plug and dumped
Marvel Mystery Oil in it to let it soak. So far it is still stuck tight. Any DIY potions you guys use to unstick a piston from the bore?

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* Origin: The Lab BBS D'Bridge/Maximus2 Old School OS/2 (21:3/105.1)

On 14 Sep 2021, Pork said the following...

I think this will qualify for DIY. I have an old 1991 Honda CR125
dirtbike that I found in a barn. It has been sitting there for at least 20 years. Other than being very dusty, the engine is stuck. I have
pulled the spark plug and dumped Marvel Mystery Oil in it to let it
soak. So far it is still stuck tight. Any DIY potions you guys use to unstick a piston from the bore?

MMO is the best potion for the job. On bikes I usually put it in a higher gear and rock it back and forth to try to loosen things up.

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... I have a really good memory, except it's short.

--- Mystic BBS v1.12 A47 2021/08/22 (Windows/32)
* Origin: BBS GameTime - mystic.BBSGameTime.com:23 (21:2/162)

soak. So far it is still stuck tight. Any DIY potions you guys use to unstick a piston from the bore?

MMO is the best potion for the job. On bikes I usually put it in a
higher gear and rock it back and forth to try to loosen things up.

That's a great idea! Thanks I will give that a try.

--- Mystic BBS v1.12 A46 2020/08/26 (Raspberry Pi/32)
* Origin: The Lab BBS (21:3/105.3)