MV Agusta BRUTALE 750 ORO, Workshop Manual

Page: 141 / 386

Air intake injection system
IGNITION SYSTEM
DESCRIPTION
The system belongs to the family of integrated systems of digital electronic ignition with advance static timing
and electronic fuel injection of the semi-phased intermittent type (injected and ignition simultaneously to cylin-
ders 1-4 and 2-3).
This ignition system consists of an engine crankshaft position sensor (pick-up), an ECU, four ignition coils of
the top plug type and four spark plugs.
The feed of the ignition coil is supplied by the battery via the power relay and is controlled by the ECU with
regards to the position of the switches of the side stand and the gearchange.
The ignition timing is precisely controlled with regards to the engine r.p.m. and the position of the accelera-
tor. Other than this basic condition, also the temperature, intake air pressure and the temperature of the
engine coolant influence the ignition timing.
N.B.
The ignition interruption circuit is incorporated in the ECU to avoid over-revving the engine. If the motor rea-
ches 12100 r.p.m., this circuit prevents the ignition for all cylinders.
WARNING
The engine could function at more than 12100 r.p.m. without a load or when changing down, even if
the interruption circuit functions and therefore could damage the engine. Never spin the engine at
more than 12100 r.p.m. in any conditions.
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