VESPA LX 4T USA Workshop Manual page 118

Engine
- Fit the vacuum chamber cover with the 2 fixing
screws paying special attention to the spring.
Inspecting the automatic choke device
- Ensure the automatic choke piston is not scratch-
ed or oxidised.
- Ensure the piston is free to slide within its hous-
ing.
- Check the piston O-ring is not deformed.
- The choke must be engaged as a function of the
ambient temperature.
- Measure the piston projection, as shown in the
figure, and check the corresponding value.
- Ensure the choke is settled to the ambient tem-
perature.
Characteristic
Projection value
11,5 mm
ambient temperature
24° C
- The choke device must disengage progressively
through electric heating.
- Check the choke resistance when this has settled
to ambient temperature.
Characteristic
ambient temperature
24° C
Electric characteristic
Automatic choke resistance
20 Ω ± 5 %
ENG - 118
LX 4T USA