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.
JUST UNSCREW THAT HUGE NUT ABOVE THE HEAD IT WILL COME OFF....( dONT HAVE IT RUNNING WHILE YOU DO THIS)
stick a flat head screw driver in the slot above head and turn counter clock wise.