Hello Junkologist, I can understand your frustration with issues with a brand new engine. I don't know what you plan to do with it, but my first thoughts are a valve stuck slightly open with the no compression issue, (so soon) it may need disassemble and a careful cleaning.
The sloppy rocker arm could also likely be repaired, but would need to see where the clearance issue is at.
Hope you get it going or maybe reach out to Jin?
The compression is leaking past the piston. If I put oil in the cylinder, the compression comes up for a few strokes until the oil gets pushed past the piston.
As for the rocker arm, I haven’t measured anything yet, but it appears that the pin is just undersized and makes for a very sloppy fit. There is just too much lost motion in the rocker arm for the detent finger to engage it consistently.
I don't know, but wonder if these are using an o-ring for piston seal like Jin's hit and miss M90 series.
It's possible the o-ring was cut on a sharp edge at assembly,something to consider....
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