Chainsaw Repair

It is a bit harder to hear 1000rpm differance when it is on 12000+ than 7-8000.
I can't do it but I can see differance and hear it in wood, but then it is not 14000..
To me it is not so important how much rpm there is cutting air, I am more interested in what happens when it hits wood and in cut.
RPM under load is not the same as in air revving. Other factors get involved.