VESPA GT 200 Workshop Manual page 174

Engine
Remove the acceleration pump piston with the ring
nut, the hood, the O-Ring and the spring from the
tank as shown in the figure.
Adequately support the carburettor and using a
rod and hammer remove the float pin acting from
the throttle control side.
Remove the float and the plunger.
ENG - 174
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Vespa GT 125-200