Very nice engine Bob, thanks for sharing !
We´re a few in here who have one (or more) of these as well.
As far as i recall, Daniel "Stoker" even made a relatively detailed comparison thread years ago, comparing the original "Sun Motor" (twin flywheel/open crankcase) version from the Phoenix era, and the current "Sun Runner" (single flywheel/closed crankcase) from PM Research N.Y.
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