PIAGGIO Vespa P125X User Manual page 37

the timing remains during the time practically unalterable.
if the backplate should be removed (for possible replacements) when reassembling it is
important in order to get a correct mechanical timing, that the notch on the backplate is
perfectly lined up with the corresponding notch on crankcase (as indicated with
arrow on fig. 25).
Specific variants to the paragraph HARD STARTING carried out at page 29. Switch key at
the position « 0 »
Rotate the key to the position « 1 ».
Generator device faulty:
Disconnect the plug cable and check (with the key switch in the position « 1 ») if spark
occurs between lead and crankcase when the kick-starters is operated. Consult your
Dealer for eventual repairs.
Notice - With the electronic ignition the timing remains practically unalterable during long time.
Notice - If after the operations at page 36 the engine does not run correctly (troubles
caused by the ignition) check electronic timing.
Such timing is correct when spark shoots in the instant where the trace (white) of the pick
- up. P - (fig. 25) is lined up between he two traces marked on the rotor slot (they can be
inspected by removing rubber protection).
In order to carry out such control (that require special tooling, stroboscopic gun etc..)
consult your Dealer.
Fig. 25 - Operations for checking the mechanic timing.