2.3 Ignition System Inspection
* Attention
• When the spark plug is not sparking, check if components of
wiring are loosened or badly contacted and make sure if all the
voltage values are normal.
• There are many brands of multimeters with different interior
impedance. The values they measured are not the same.
Connect a high-voltage shunt or an ammeter with input impedance
higher than 10MΩ 10CV to the multimeter.
2.3.1 Primary voltage of ignition coil
If an old spark plug is removed and replaced with a good one, ground it with engine.
* Attention
Test when wirings of all the circuits are correct.
Normal cylinder compression pressure means to test
with spark plug installed on the cylinder head.
Connect lead wire of ignition coil; a shunt is connected between
the terminal (black/white) of primary coil and the grounding
vehicle block.
Press starting motor button or kick starting pedal to measure
primary peak voltage of ignition coil.
Min. voltage: over 95V.
*Attention
Please do not touch the metal parts of testing probe with your fingers while
measuring the voltage, or you will be shocked. Please take care.
2.3.2 Trigger
* Attention
Inspect when spark plug is installed on the cylinder head and
compression pressure is normal.
Disconnect connector 4P and 2P from CDI assembly. A
peak-voltage shunt is indirectly connected to the 4P connector
(black terminal) and 2P wiring-terminal connector of trigger
(blue/white terminal). Press starting motor button or kick pedal
level to measure primary peak voltage of trigger.
Connecting method: positive (+) to blue/white, negative (-) to
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