lawn-boy 5124 1977 commercial 19" cut

The fuel leak from the carb stopped - no idea why.
Wilbuild

It is not impossible to have a spec of dirt hold the valve open. With the bouncing around they take from cutting lawns it might've been rinsed through the engine and now the valve seats tight, but if the needle valve looks like this

P5110003.jpg

it will never seat tight and leak making the engine run rich, smoke, run at lower rpm then it should, go through more fuel, fowl spark plugs.
Replace it if worn.
 
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