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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.
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How do you adjust carburetor on weed eater featherlite FL21?
by turning the screws on the side of the carburetor
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Why won't your weed eater stay running?
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