Husqvarna 50 Workshop Manual page 39

Remove the low and high speed mixture screws.
Exchange the mixture screws if the screw tips are bent or
damaged.
If the carburetor is very dirty it will be necessary to clean
the fuel passages located underneath the fuel circuit
plate ( Walbro WA) or the welch plug(s) ( Walbro WT).
To remove a welch plug very carefully punch a hole
through the center of the plug. Pry the plug sideways to
remove the plug from its seat.
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