Derbi GPR 125 Racing, Workshop Manual

Page: 166 / 247

5 - FUEL SUPPLY SYSTEM
166
5.5 - CHECKING THE AUTOMATIC CHOKE
- Check that the automatic choke piston is not scratched or
corroded.
- Check that the piston slides freely.
- Check that the piston sealing gasket is not distorted.
- The choke will be on for more or less time, depending on
the atmospheric temperature.
- Measure the piston protrusion as indicated in the figure
and check the corresponding value.
- Ensure that the choke is adjusted to atmospheric tempe-
rature.
- The choke must be disconnected gradually by means of
electric heating.
- Check the resistance of the choke when it is adjusted to
atmospheric temperature.
RESISTANCE VALUE:
20
Ω at 24° C
- Connect the automatic choke to a 12v battery and check
that the piston reaches the maximum protrusion.
MAXIMUM OVER-MEASURE-
MENT: 10.5 mm
- The effective heating time depends on the atmospheric
temperature.
MAXIMUM HEATING TIME FOR
THE MEASUREMENT: 5 min.
- If protrusions, resistances or times are found to be different
to those stipulated, the choke should be renewed.
TAKE CARE NOT TO PROVO-
KE A SHORT CIRCUIT WHEN
CARRYING OUT THIS CHECK.
TO THIS END, USE A LENGTH
OF CABLE WITH A TERMINAL
ADAPTED TO THE CONNEC-
TION WITH THE CHOKE.
N.B.
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