Weed trimmer engine problem

I cleaned carb with gasoline and nothing is cracked. Maybe I need to clean it also with compresed air. And again question: When I tighten that screw do I get more or less fuel?
Less fuel turning it in (tightening) it there is no air passage coupled to that valve it just meters the fuel flow thru it.
 
If the primer bulb has a bad check plate in it , it won't keep pulling fuel. that's why it runs choked maybe. From the looks of picture, you might replace it.
My primer bulb looks good and it is full of fuel so I think it is okay. You are probably looking steves picture.
 
So yes more fuel flow is needed!
The micro pin holes in those carbs are really hard to blow out, if you break it down far enough you'll have a better chance of clearing them out. I've had to take a piece of wire brush and use it to push varnish out of them.
 
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