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Description of the fuel injection-ignition system
A throttle position sensor (6) is fitted onto the rear cylinder throttle shaft. It sends to ECU an indirect
signal of air amount taken in by the engine (indirect value for engine load).
Operating stages
Normal operation
When the engine is fully warm, the unit calculates injection time and advance, by comparing the stored
map values, in accordance with the RPM and throttle position. The calculated quantity of fuel is fed
through injectors in one single sequential delivery to the two cylinders.
Starting
When the ignition switch is turned to ON, the control unit feeds the fuel pump for a few moments to
put fuel feed hydraulic circuit under pressure. It receives the throttle position and engine temperature
signals. When the engine is started, the unit receives the engine RPM and timing signals that allow it to
proceed with injection and ignition. To facilitate start-up, the basic mixture is made richer in
accordance with the engine temperature. During starting, the ignition advance is fixed (0°) until the
engine starts. When the engine starts, the control unit takes over the advance control according to the
values stored in the mapping and makes necessary corrections according to the air and engine
temperatures.
Acceleration/deceleration
During acceleration, the ECU makes the mixture richer for improved engine performance.
Acknowledgement of this condition is given as the rider quickly turns the twistgrip to open the throttle.
During a rapid deceleration, which is acknowledged as the rider quickly turns the twistgrip to close the
throttle, the ECU makes the mixture leaner for reduced emissions and fuel consumption.
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