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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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