Ol'George is right, they won't run with a clogged exhaust; maybe not mud dabbers, but it could be a clogged/carboned spark arrestor screen. So common in string trimmers that that's pretty much where I start looking when someone brings me one to repair (or just gives to me - that's happened a lot lately, folks getting rid of their gas equipment and buying battery powered tools).
If the carb isn't delivering sometimes a shot of starting fluid or an ounce or two of mix will get it to run for a few seconds indicating it has spark and is in time.
If the exhaust is clear and a shot of fuel won't get a pop or two, then it's time to look at the piston/cylinder through the exhaust ports and see what can be seen. Also a quick look at the fly wheel key.
Let us know what you find.
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147 w/Electric Lift - the tractor that says "Ni!"
147 w/no lift at all - the tractor called "WallE"
QA48 deck, 1a tiller with one extension, QA36B snow thrower, QA42 blade
and various other bucketraters, grassenators and dirtavators.
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