Derbi GPR125 Workshop Manual page 157

5 - FUEL SUPPLY SYSTEM
Unscrew the bayonet fitting 1/8th of a turn and extract it,
then remove the spring and the valve needle.
- Remove the 4 screws indicated in the figure.
- Remove the complete bowl with the throttle pump, control
and gasket.
- Remove the sealing gasket.
- Remove the throttle pump intake and output valve from
the bowl.
N.B.
157
PROCEED WITH CARE, AS THE
VALVES COME APART AND ARE
MADE UP OF A JET, SPRING
AND SPHERE.
AVOID DISMANTLING THE PUMP
PISTON AND ITS DRIVE.