It should be an OHV engine. It doesn't have a compression realease but It also only has around 9:1 compression, so it should not need a compression release.
Going off of the information given in your last post, I would suspect that one of the lash adjusters is either backed way off, or broken/missing, OR it has a bent push rod or rocker arm. I think a littlle exploration is in order. I would start by simply removing the valve cover.
The good news is, most of these parts are cheap and easy to get.
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