Ignition Timing - Honda XR125LK Owner's Manual

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IGNITION PULSE GENERATOR PEAK
VOLTAGE
• Check the cylinder compression and check that the
spark plug is installed correctly in the cylinder head.
Disconnect the ICM 4P connector.
Connect the peak voltage adaptor [1] or tester probes to
the ignition pulse generator wire terminal of the 4P
connector [2] and body ground.
TOOL:
Imrie diagnostic tester (model 625) or
Peak voltage adaptor
with commercially available digital multimeter
(impedance 10 MΩ/DCV minimum)
CONNECTION:
Blue/yellow wire terminal (+) – Body ground (–)
Shift the transmission into neutral.
Turn the ignition switch to "ON".
Crank the engine with the starter motor and read
ignition pulse generator peak voltage.
PEAK VOLTAGE: 0.7 V minimum
If the peak voltage measured at the ICM connector is
abnormal, measure the peak voltage at the alternator
connector.
Remove the left side cover (page 2-2).
Disconnect the ignition pulse generator (Blue/yellow)
wire connector [1] and connect the peak voltage
adaptor [2] probes to the pulse generator side
connector and body ground.
In the same manner as at the ICM connector, measure
the peak voltage and compare it to the voltage
measured at the ICM connector.
• If the peak voltage measured at the ICM is abnormal
and the one measured at the ignition pulse
generator is normal, the wire harness has an open
or short circuit, or loose connection.
• If both peak voltages are abnormal, follow the
checks described in the troubleshooting chart (page
4-3).
Refer to procedure for alternator stator replacement
(page 11-4).

IGNITION TIMING

Warm up the engine.
Stop the engine and remove the timing hole cap and O-
Read the
ring.
instructions for
timing light
Connect a timing light [1] to the spark plug wire.
operation.
Start the engine, let it idle and check the ignition timing.
07HGJ-0020100
IGNITION SYSTEM
[1]
[1]
[1]
[2]
[2]
4-5