APRILIA SCARABEO 500 2008 Service Station Manual page 256

Injection
The ignition advance value can be measured at any time with the diagnostic tester.
It is possible to check whether the ignition advance determined by the injection system does in fact
correspond with the value actually activated on the engine, by means of the stroboscopic light.
Proceed as follows:
- Remove the external transmission cover as des-
cried in the «Automatic transmission» chapter.
- Remove the cap to inspect the TDC reference
found between the flywheel and cover housing.
See «Flywheel cover» chapter.
- Acting on the driving pulley nut, turn the engine
until the references to determine the TDC are
found.
- Repeat for the reference between the driving pul-
ley and the transmission cover.
INJEC - 256
SCARABEO 500