Can't really see a reason for the lack of compression for the 2 cyl.
The pic of the head looks like the exhaust valve is not seated all the way, but probably illusion from photo.
Too bad you didn't do a leak down on them.
I'd remove springs and vales and check for bent/burned valve(s).
With exhaust noise when running probably exhaust side of the problem?
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John Wallace - johnta1
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