This is a Hyuai P18 or P127 Carburetor from a Honda GX200 clone engine also called a JF200. If your engine hunts/surges particularly at idle this video may help you identify the culprit. You should definitely check/clean/replace the idle jet. I've recently bought a carb cleaning kit on Amazon which you may find helpful for all of your carb tuning and cleaning.
https://www.amazon.com/dp/B079L4PKWQ/...