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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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