Would a compression test be compromised by the KACR?
NO Damocles, it would Not!
The engine has got to start with currently available compression!
The KACR is in there to allow for a smaller, lighter, starter motor and battery.
There is NOTHING in the OEM service manuals about active vs in-active "Kawasaki Automatic Compression Release's", Cold Cranking Compression numbers. We have to start from Cold. I couldn't care less about Hot compression numbers (or DE-Activated KACR numbers)! Whoever even wrote that in a book 100 years ago didn't Work on them for a living!!!
This is what a "Cylinder Leak-Down Tester" is for.
If initial CCC is found to be low, we measure and adjust tappet clearances to the wide end of specifications. Then re-check CCC again. If still found to be at or below minimum (77psi) CCC, we use the Cylinder leak-down tester to decide WHY the CCC is too low and What needs to be Done About IT.
To the best of my knowledge and experience, all years of KLR650's start very well at 'rideable' temperatures with CCC #'s of 90-125 PSI! And reasonably well at 75-80 psi CCC.