VESPA GTS Super 300 ie 2008 Service Station Manual page 46

Maintenance
- Remove the transmission compartment air intake
cover shown in the picture.
- Rotate the driving pulley fan using a screwdriver
until the reference marks between the flywheel
and flywheel cover coincide as shown in the pic-
ture.
- Bring the reference mark onto the transmission
side between the fan and the transmission cover
as shown in the picture.
- Refit the spark plug.
- Refit the plastic cap on the flywheel cover.
- Adjust the spark gap to the contact position (no
reference mark visible) and install it on the engine
between the spark plug and spark plug cap
- Connect the induction clamp on the spark gap
cable respecting the proper polarity (the arrow on
the clamp must be pointing at the spark plug).
- Connect the diagnostic tester.
- Start the engine.
- Select the «Parameters» function in this menu.
- Set the stroboscopic light control to the traditional
four-stroke engine position (1 spark, 2 revs).
- Check that the real values of rpm and ignition
advance match those measured using the diag-
nostic tester.
If the values do not correspond, check:
- distribution timing
- engine speed sensor
- injection control unit
Specific tooling
020922Y Diagnosis Tool
020330Y Stroboscopic light to check timing
020621Y HV cable extraction adaptor
MAIN - 46
Vespa GTS Super 300 ie (2008)