PIAGGIO Runner 125 Service Station Manual page 197

Runner 125 - 200
Engine
Remove the tank with the intake pump, its control
and gasket.
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 - 197