I don't have a direct answer to your question, outboards I owned were all older than that, maybe just a couple things to consider. How is it getting in, maybe not rain, are you docking it stern out, where waves can play into it. Secondly why is it not draining out, I had outboards where spiders make nests and clog stuff up, is there any tree debris or other junk inside?
Even if it is running ok my instinct would be that it should not hold water
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