Inspecting The Valve And Needle - PIAGGIO Liberty 125 Workshop Manual

Liberty 125 - 200 4tempi
- Check the accelerator pump control arm shows
no signs of abnormal or excessive wear.
- Check the clearance of the arm, at the end of its
travel, is 3 ± 0.1 mm
- Check the return spring on the accelerator pump
control arm has not been over-extended or de-
formed.
- Pre-fit the spring to the control arm as shown in
the diagram.
- Re-fit the control arm to the carburettor body,
whilst holding the butterfly valve open.
- Tighten the control arm screw fastener to the
specified tightening torque.
- Once assembled, check the mechanism is work-
ing correctly.

Inspecting the valve and needle

- Undo the bayonet fitting by rotating it 1/8th of a
turn, remove the fitting and remove the vacuum
valve needle and spring.
- Check the needle for signs of wear and that the
stay is set on the second notch from the top.
- Check there are no signs of scoring on the out-
side of the valve.
- Check the two fuel supply holes are unobstruc-
ted.
N.B.
THESE TWO HOLES ARE OF DIFFERENT DIAMETERS
Engine
ENG - 133