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Try a good penetrating oil and let it sit for a few days adding more as it soaks in. Then "gently" tap on the pistons. Once free, slowly and carefully work the crank back and forth lubricating the pistons at the same time.
I don't know much about this particular model of Yanmar but I can tell you that they make a great product. Number "2" is probably a fuel related camshaft or pump driveshaft. Other members may know more.
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