Gilera Runner RST Purejet, Service Manual, Page: 150 / 235

ignition timing check
The ignition advance is electronically determined
on the basis of the ECU parameters. For this rea-
son, it is not possible to state reference values
based on the engine rpm.
The ignition advance value can be detected by the
parameters function of the diagnostic tester. The
degrees displayed in the parameters function may
be checked for matching with the actual ignition
command degrees.
The following is required for this check:
• Diagnostic tester
• Stroboscopic lamp
• Adapter for the H.V. cable signal
Remove the flywheel cover. Adjust the adapter for
detecting the H.V. cable signal to a position be-
tween the 4th and the 5th reference and install it
between the spark plug and the original cap. Con-
nect the induction clips of the stroboscopic lamp to
the screened cable of the adapter according to
their polarity. Select the lamp control to the con-
ventional engine 2T position (1 spark = 1 rev). With
engine idle, set a degree phasing on the lamp
equal to the indication of the advance shown in the
tester parameters.
Check that the fifth to last tooth in the direction of
rotation is aligned with the rpm - phase sensor
core, as shown in the figure. The position denotes
the top dead centre.
Checking a clear lack of correspondence of the advance values, continue with checks on the phase -
rpm sensor and the ECU.
N.B.
THE STROBOSCOPIC LAMP CANNOT DISPLAY A FLYWHEEL KEYING ERROR. TO THIS PUR-
POSE, IF YOU HAVE ANY DOUBTS, CHECK THAT THE FLYWHEEL POSITION INDICATED IN
THE FIGURE ACTUALLY MATCHES THE TOP DEAD CENTRE.
pure jet injection
Runner RST Purejet
INJ PJ - 38