No compression when turning by hand clockwise means no compression when "being turned" anticlockwise by combustion pressure. I was helping a guy last week with a Funtana 90 powered by an ST G2300 with about 5 hours running from new. It was the same - no compression when turned by hand clockwise. We couldn't start it by hand for the love or the money.

I hand start all my engines. I have found all naturally aspirated four strokes to respond well to the backflip method, as long as they are generously primed. The YS .63 takes quite a bit of priming but starts well when flipped through compression (anticlockwise) like a two-stroke. My YS 1.10 when cold (start of day) is the best self primer of all - put the glow heat on unprimed, flip through compression about 5 times and she'll start to fire and one or two flips later, she'll fire up into a nice safe idle.