Suzuki DF70A - Page 212

1H-3 Ignition System:
Ignition Timing Chart
The following chart is an example for ignition at 10° BTDC.
Ignition Timing Control Mode
• When Cranking
The ignition timing is fixed at 5° BTDC until the engine starts.
• When Idling / Trolling
The ignition timing is controlled within the range of 0° ± 5° BTDC to provide stable engine operation at the specified
idling / trolling speed.
• When Running (Normal Operation)
The ignition timing ranges between 0° – 27° BTDC, depending on engine operating conditions.
No.1 cylinder
No.3 cylinder
No.4 cylinder
No.2 cylinder
CKP sensor
signal
CMP sensor
signal
In.
Ex.
Ep.
Cm.
In.
Ex.
Ep.
Cm.
In.
Ex.
Ep.
Cm.
In.
Ex.
Ep.
Cm.
In.
Ex.
Ep.
Cm.
In.
Ex.
Ep.
Cm.
No.1 Ignition
signal
No.3 Ignition
signal
No.4 Ignition
signal
No.2 Ignition
signal
140° 220°
40° 40°
180°
100°
140°
CMP sensor - 6 signals / 720°(crankshaft 2 rotation)
32 signals / crankshaft 1 rotation
Spark timing
TDC
TDC
TDC
TDC
TDC
TDC
TDC
TDC
Cm.: Compression, Ep.: Explosion, Ex.: Exhaust, In.: Intake, TDC: Top Dead Center
I9J011180003-05
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