Inspecting The Automatic Choke Device - Derbi GP1 125-250 c.c. Workshop Manual

I I
NSPECTING THE AUTOMATIC CHOKE DEVICE NSPECTING THE AUTOMATIC CHOKE DEVICE
- Check that the automatic starter piston exhibits no scrat-
ches or oxidation.
- Check that the piston slides freely into the seat.
- Check that the piston sealing gasket exhibits no deforma-
tions.
- The starter must be more or less inserted according to the
ambient temperature.
- Measure the projection of the piston as shown in the figure,
and check the corresponding value.
- Ensure that the starter settles at ambient temperature.
- Install the starter on the carburettor checking the proper
positioning of the 0-Ring, insert the plate with the knurling
resting against the starter, tighten the 2 fixing screws.
- Orientate the starter as in the figure.
- Install the safety casing.
- The actual heating time depends on the ambient tempe-
rature.
- If you detect projections, resistance or times dif- fering from
those prescribed, replace the starter.
- The starter should gradually disconnect by the electric hea-
ting.
- Check the starter resistance when settled at ambient tem-
perature.
- Using a 12V battery, power the automatic starter and check
that the peiston reaches the maximum protrusion.
Characteristic
Automatic starter check: projection value
12,5- 13 mm at about 20°C
Automatic starter check: Maximum projection
18,5- 19 mm
Automatic starter check: Max time
5 min
Electric characteristic
Automatic starter check: Resistance about 30 Q
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