Thanks to the EPA, you now need special tools to adjust trimmer carburetors. This actually exacerbates the pollution problem as most people will run their machine at half or full choke till it dies before taking it to a shop to have it adjusted or repaired. If you don't have the tools and don't care to wait the two weeks for the shop to do it, get a butt-splice connector and remove your adjustment screws. Using a Dremel or similar tool with a mini-cutter blade ,carefully machine a slot for a straight screwdriver on the screws. Gently screw the screws till they bottom out, then back them off about 1 1/4 turns just to get it started. Let it warm up for two minutes. Adjust low idle till it smooths out, then accelerate and adjust high idle using small increments. If this doesn't do the trick, it may be time for a rebuild or new carb.
Then again you could always just use the butt connector to make the adjustment and forget replacing the screws.
by turning the screws on the side of the carburetor
The carburetor on a Weed Eater Featherlite SST25 is adjusted by turning the screws on the side of the carburetor. They control the idle mixture and idle speed of the engine.
Bad\dirty carburetor or not getting gas.
To adjust the carburetor on a Weed Eater Featherlite FL25C, locate the three adjustment screws marked "L" (low speed), "H" (high speed), and "T" (idle). Start the engine and let it warm up, then adjust the "L" screw for smooth acceleration and the "H" screw for maximum power without causing the engine to sputter. Finally, adjust the "T" screw to achieve a steady idle. Always make small adjustments and test the engine after each change to find the optimal settings.
The air mixture screw does that.
You need a"Pac Man" carb adjustment tool.
You can get rid of an old weed eater at a recycling center. If you take the weed eater apart, you can get money for the metal.
Mister Weed-Eater was created in 1993.
The exhaust could be plugged with carbon, carburetor has debris in it and needs to be cleaned, fouled spark plug
weed whacker
Due to the newer carb standards their is no universal rpm or settings for a weedeater you would have to contact a service center to look up the settings for your weedeater, they also normally take a special tool nowdays that you would have to have to adjust it.
Throttle cable is probably pinched somewhere, or check the butterfly on carburetor, might have a broken return spring, or debris binding the shaft.