Husqvarna 50 Workshop Manual page 46

rpm
max.
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Begin with the low speed mixture screw. Using carburetor
screwdriver P/N 5016002-02, turn the L screw in until the
engine rpm's just start to decrease and note the screw-
driver position. This is referred to as the lean drop setting.
Now turn the L screw out until the engine rpm's just start
to decrease again and note the screwdriver position. This
is referred to as the rich drop setting.
Turn the L screw back in to the mid-point between the
lean and rich drop off settings, then open 1/4 turn. Adjust
the idle speed to 2500-2800 rpm with the T screw again if
necessary then recheck the L screw adjustment as
previously described.
With the low speed mixture adjusted, the high speed
mixture (screw H) is ready for adjustment. Run the
engine at wide open throttle while observing the
tachometer. Adjust the H screw so that the maximum
no-load speed does not exceed 12500 rpm. After setting
the high speed mixture, allow the engine to return to idle
speed, then check for hesitation on acceleration. Repeat
the complete final adjustment procedure of both the L and
H mixture screws if necessary.