The carb on your hedge trimmers seems similar to the one I just replaced on my husky string trimmer. I was about 1/2 turn out on the low speed mix screw and a full turn out on the high speed (from where they were set originally not fully seated) . Might help, might not, but a good place to get you in the ballpark. Regardless, if you can get it running out of the box that will make adjustments that much easier.
I'm not sure if you ordered an OEM part or a chinese knockoff but the aftermarket carbs always require a little tuning in my experience.
I'm not sure if you ordered an OEM part or a chinese knockoff but the aftermarket carbs always require a little tuning in my experience.