Suzuki DF 60 Service Manual page 61

IGNITION TIMING CHART
• The following chart shows the example for the ignition at BTDC 24°.
• The ignition timing is varied by the condition of the engine running.
• Angles indicated in the following chart show the CRANKSHAFT angle.
34-signals/360˚
10˚
CKP sensor
signal
CMP sensor
signal
ON
#1 ignition
OFF
signal
In.
#3 ignition
signal
Ex.
#4 ignition
signal
Ep.
#2 ignition
signal
Cm.
In. : Intake, Cm. : Compression,
CONTROL MODE
WHEN CRANKING:
The ignition timing is fixed at BTDC 5° until the engine starts.
WHEN IDLING/TROLLING:
The ignition timing is controlled within the range of BTDC 4° to BTDC 16° to provide stable engine operation
at the specified idling/trolling speed.
When the shift lever is in neutral, if engine speed exceeds 1000 r/min, ignition timing remains fixed at BTDC 5°.
WHEN RUNNING (NORMAL OPERATION):
The ignition timing ranges between BTDC 10° – 33° (DF60) or 29° (DF70), depending on current engine
operating conditions.
WHEN DECELERATING:
When the throttle valve is closed suddenly, turning the CTP switch "ON", ignition timing is delayed for a
programmed duration to prevent engine stalling or unstable running.
SPECIFICATION
Ignition system
Advance
Ignition timing
Firing order
30˚
120˚ 120˚
4-signals/720˚
24˚
Cm. Ep.
TDC
In. Cm.
TDC TDC
Ex. In.
TDC
Ep. Ex.
TDC TDC
DF60: BTDC 4° – BTDC 33°,
ENGINE CONTROL SYSTEM
120˚
Ex. In. Cm.
TDC
Ep. Ex. In.
TDC
Cm. Ep. Ex.
TDC
In. Cm. Ep.
TDC
Ep. : Explosion, Ex. : Exhaust,
Full-transistorized ignition
Electronic microcomputer control
1 – 3 – 4 – 2
Spark timing
Ep. Ex.
TDC TDC
Cm. Ep.
TDC
In. Cm.
TDC TDC
Ex. In.
TDC
TDC : Top Dead Center
DF70: BTDC 4° – BTDC 29°
3-13
In.
Ex.
Ep.
Cm.