Any tips on unseizing a old rusty piston?

dan /
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Hi, i just got a minarelli engine in horrible condtition. The piston is seized in the cylinder, and looks like it has been like that along time. i want to unseize it with doing as little damage as possible. any tips? i have been soaking it in oil, and hitting it with a wooden mallet. thanks in advance.

dan

moped army

swarm and destroy

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