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Gordon Duax

Will altering the squish gap change RPM ? 

It’s actually the other way around…

Altering your rpm will change the squish.
I’ve had a 125 bike engine that was set up with .016″ squish, but if revved above 16k, would go to zero, due to crank flex.

Would start making a ringing sound above 16k, and when torn down both the piston & head would show light contact.
It never hurt anything, but I didn’t dare let it rev past that point.
I just used it as a shift indicator :)

I am sure this is happening on most engines to some extent.