You need to do an actual cleaning on it. Take it off, take it apart, soak it (ultrasonic cleaner if you have one) clean any passages, blow it out, put it back together.
The average owner of a low cost engine doesn't know how to properly set them anyway. By the time a carb would actually wear out the low cost engine would be long dead. Finally with the improvement in machining tolerances that exist now there really is no need to have an adjustment screw as they are all machined pretty much exactly the same.
In my experience most sputtering actually has nothing to do with mixture ratio, it is crap in the carb. Only way to fix is to clean it anyway. Sure you could open it up and it will run ok for a while but as soon as that little piece of whatever moves now you are running rich.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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