Husqvarna GTH2550XP Owner's Manual page 26

SERVICE AND ADJUSTMENTS
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
The throttle control has been preset at the factory and
adjustment should not be necessary. If adjustment is
necessary, see Engine Manual.
TO ADJUST CHOKE CONTROL
The choke control has been preset at the factory and
adjustment should not be necessary. If adjustment is
necessary, see Engine Manual.
TO ADJUST CARBURETOR
Your carburetor is not adjustable. If your engine does not
operate properly due to suspected carburetor problems, take
your tractor to an authorized service center for repair and/or
adjustment.
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