IGNITION AND ELECTRICAL 3-3
IGNITION TIMING CONTROL
Outline
The ignition timing varies based upon engine speed.
The pulser coil monitor current engine speed and send signals to the CDI unit.
Based on this signal, the CDI unit determines the optimum ignition timing and supplies voltage to the primary
winding of the ignition coil.
Control mode
When starting (at the time of cranking):
The ignition timing is fixed at ATDC 10° until the engine starts.
When operating (normal operation):
The ignition timing varies in the range of ATDC 5° – BTDC 30° according to the engine operating condition.
Basic sensor
Ignition timing is deter-
mined by a digital map de-
signed in relation to engine
speed.
CDI unit
Signal
Ign.coil
Pulser coil :
Informs CDI unit of engine speed and crankshaft angle.
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