Ignition System Inspection - Generic TR 125 Service Manual

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6.3 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.
High voltage shunt
• 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.
6.3.1 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.
Disassemble central cover
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
Black
黑
testing probe with your fingers while
红/白
measuring the voltage, or you will be
Red/ White
shocked. Please take care.
6.3.2 Charging coil
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