The other site I had was better, Bill....as you can see....

....if the guy had run the engines first to seat the ring, and spun them over
with the starter (the same way you would check a car engine for compression)
his readings would have been much higher. The actual maximum compression for
a perfect condition old model Saito .80 is thru the roof. [X(]

The normal perfect compresion for a two stroke engine is around 125 PSI.

FBD.