VESPA ET4 50, Workshop Manual

Page: 114 / 185

- Check the diaphragm is in good conditions and
remove the remaining components of the acceler-
ating pump following these steps:
- Insert the O-Ring in the pipe.
- Insert the diaphragm together with the pin and its
spring.
N.B.
REPLACE THE DIAPHRAGM IF THERE ARE SIGNS OF UN-
DULATIONS, CRACKS OR HARDENING.
- Fit the accelerating pump diaphragm cover and
tighten the 2 fixing screws making sure the spring
below is correctly positioned.
- Fit the rubber bellows protecting the pin in the
upper part of the accelerating pump.
Level check
- Tilt the carburettor so that the needle valve at the
fuel supply is closed and the float weight does not
affect it.
- Check that the diaphragm closing line and the
float central line are parallel as shown in the figure.
- Blow air in to the tank and then assembly it and
its gasket on the carburettor body with the 3 fixing
screws.
N.B.
-ALWAYS USE NEW RINGS AND GASKETS FOR REFIT-
TING.
WARNING
THE SCREW IN THE TANK BOTTOM IS A BLEEDING ONE
AND CONSEQUENTLY IT ONLY REQUIRES CLEANING.
Engine
ET4 50
ENG - 114