Derbi GP1 125-250 c.c. Workshop Manual page 158

Remove the cap conveying the fuel to the starter nozzle as
shown in the figure.
- Remove the maximum nozzle.
- Remove the emulsifier.
Remove the spray nozzle.
N.B.
THIS OPERATION IS REQUIRED TO PREVENT LOSING THE
SPRAY NOZZLE DURING THE CARBURETTOR CLEANING OPE-
RATIONS. IF THE SPRAY NOZZLE IS FORCED INTO ITS SEAT,
DO NOT REMOVE IT TO PREVENT DAMAGING IT.
157