Other 1977 Kawasaki KE250 Enduro

Hi everyone i'm new on here! i'm in the process of buying a 1979 red Ke250 very tidy but there's room for improvement the tank has a few battle scars etc. Can anyone please tell me whats a good PSI reading for the Cylinder i can't find any info on the web. As ive been told the barrel on these can not be rebored to it's quite important to know what it should be.
 
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