Ok, so sorry if this is a stupid question. I searched it and couldn't find the answer and I've also no way of testing this with my own set up (that I know of).
I'm wondering if it's possible to play PAL carts at 60Hz. From what I understand the 50Hz limitation was a hardware thing so playing, say, Sonic 1 at 60Hz with a PAL cart should be possible, yes?
Which emulator are you using? There should be a setting for that.
KFusion. I haven't been able to find such an option but I'll take another look.
Try forcing the region to US.