Ignition Timing Check - PIAGGIO Ape Workshop Manual

APE TM Benzina
paragraphs we recommend, therefore, to include in the control tools an Ohm meter with the charac-
teristics outlined above.
C) IGNITION TIMING CHECK
The timing check may be useful for example if the motor is not operating properly (start-up difficulties;
decreased performance and power; difficult or irregular recovery speed etc.); if the failure does not
depend on the carburetion, it may be caused by irregularities of the ignition timing.
This possibility is, however, considered quite rare since, due to the characteristics of the ignition system,
the timing adjustment remains unchanged over time; since the problem arises in most cases from ir-
regular operation of the control unit, to be sure please follow the steps outlined on the side for verification
of the aforementioned device.
If however, after checking the carburetion and the
control unit, the desired improvements are not ob-
tained and there is doubt whether the anomalies
are due to the ignition timing, proceed to check the
latter, operating as follows:.
1) Insert, into the hole (1) a rod of Ø 5 mm.; run the
engine manually until when the end of the rod,
coming into correspondence with the other hole on
the rotor, does not fit.
In this condition the engine is in ignition advance position.
2) Make a mark with white paint on the fan cover, in correspondence with the flap of the flywheel bearing
the reference for the timing.
3) Connect a stroboscopic lamp (type TECNOTEST 130/P or other similar) at ignition; the connection
will be made directly on the spark plug or on the H.V. cable, etc. depending on the type of stroboscopic
lamp available and the specific operating instructions. Then start the engine and bring it to about 4000
- 5000 rpm.
4) The engine will be properly timed to the lamp when the two marks are aligned, or at most, moved to
within a tolerance range of 4° (i.e., within 2° to the right and 2° to the left of alignment position).
5) If the mark of the flywheel rotor is shifted compared to the crankcase more than the allowed tolerance
(or other major irregularities appear during the check), replace the stator or the control unit.
N.B.
FOR VEHICLES OF NEXT PRODUCTION, THE FAN COVER WILL BE FITTED WITH A REFER-
ENCE FOR TIMING, SO THE OPERATIONS DESCRIBED IN POINTS 1 AND 2 WILL NOT BE
NECESSARY.
General guidelines
GEN - 13