Spark Plug - VESPA GTV 250 i.e. 2008 Service Station Manual

Maintenance
- Check that the real values of rpm and ignition
advance match those measured using the diag-
nostic tester.
If the values do not match, check:
- distribution timing
- engine speed sensor
- injection control unit
Specific tooling
020922Y Diagnosis Tool
020330Y Stroboscopic light to check timing
020621Y A.T cable pick-up adapter

Spark plug

- Rest the scooter on its stand
- Open the saddle and take out the helmet com-
partment
- Disconnect spark plug HV wire hood;
- Unscrew the spark plug using the wrench sup-
plied;
- Check the conditions of the spark plug, make
sure the insulation is intact, that the electrodes are
not excessively worn or grimy, the conditions of the
washer, and measure the distance between the
electrodes using the appropriate feeler gauge.
-Adjust the distance if necessary by bending the
side electrode very carefully. In case of anomaly
(as described before) replace the spark plug with
another of the recommended type;
- Fit the spark plug with the correct inclination and
manually screw it all the way down, then use the
special spanner to tighten it.
MAIN - 36
Vespa GTV 250 i.e.