After disassembly I also found the bottom end had been previously stuffed. Damage was evident to the bottom case rear cylinder. The bike was advertised as having never been opened. Clearly that is not the case. But the cylinder bores are in good shape and piston to bore clearance was good. Still don't understand the squish but it measures proper. Decided to go with new OEM crank, pistons, rings, etc. but reuse the barrels. I replaced the front head with a new OEM rear. Deleted the oil pump, boost bottles, kickstart. Reeds are newer Boyeson Power Reeds. And a new clutch will go in as soon as I get the missing thrust washer behind the water pump. Leak down test held 5 PSI but going to 7 PSI and there was leakage across the center seal. I've read others have gone us to 10 PSI. It can't be worse than what was in there as when cold starting it would take up to a full minute for the second cylinder to kick in.
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MC21R9N track
MC18R2J track
CBR954
CR250