SELVA MARINE Kingfish 25, Service Manual

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2
Basic ignition timing control
The ignition signals are output for the ignition timing that has been programmed according to the
engine speed.
Normally, the ignition timing is controlled so that it is between BTDC 6 degrees and BTDC 26
degrees.
In addition, this ignition timing is controlled when the engine is started, during acceleration, and
according to the engine cooling water temperature.
a
Ignition timing (BTDC)
b
Engine speed (r/min)
Starting ignition timing control
When the engine is started, the ignition timing is set to BTDC 10 degrees for 3 seconds.
0
0 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6200
5
10
15
20
25
30
a
b
Control-starting condition Control time Ignition timing
Engine speed is 150 r/min or
more for 0.5 second
3 seconds BTDC 10 degrees
Ignition control system