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I just wonder did you break another ring or 2 putting it back together? And as the others said piston ring gap of the rings you installed is what, and make sure if you removed piston it is oriented correctly. How exactly did you break the rings to begin with when tearing it down are you sure you broke them or might they already have been broken from a bur or something in cylinder. Just my thoughts on this.
Joe
ps if adding some 2 stroke oil into the cylinder raises compression then its most likely a broken ring or to much ring gap in my humble opinion since you said cylinder and piston looked good. You should be able to feel what the compression feels like just turning flywheel by hand before and after oil is added even before you try your psi meter or try and start it. Also did you clean the ring groove very well on the piston before putting new rings on it making sure the new rings didn’t bind in piston. I normally use one of the old broken ring to help clean the grove.
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