Inspecting The Valve And Needle - APRILIA SPORTCITY ONE 125 Service Station Manual

SPORTCITY ONE 125
- The screw final position should be determined by an exhaust fume analysis.
- Adjust the carburettor by turning the screw twice from the close position.
Level check
- Place the carburettor inclined as shown in the figure.
- Check that the float reference is parallel to the tank coupling surface
- If different positions are detected, change the plunger control metal plate direction to obtain the position
described above.

Inspecting the valve and needle

- Check that the tapered pin of the vacuum valve does not show wear.
- Check that the depression valve does not show threads on the external surfaces.
- Check that the vacuum intake hole is not clogged.
- Check that the diaphragm is not damaged or has hardened, otherwise replacement the whole valve.
- Insert the tapered pin into the vacuum valve housing.
- Reassemble the vacuum valve on the carburettor body taking care that the tapered pin is inserted into
the sprayer.
NOTE
THE VALVE CAN BE INSERTED IN ONLY ONE POSSIBLE POSITION.
Engine
ENG - 127