9. Ignition System
Inspection of Ignition System
Note:
¾ If the spark plug generates no spark, check first if
there is come-off, loosening or poor contact with
the wiring, then measure the peak voltage.
¾ Different multimeter has different input resistance
and shows different readings. Measure with digital
multimeter with input impedance over10M/DCV ).
Connect peak voltage oscillograph with digital
multimeter.
Special tools
Peak voltage oscillograph 519-922-150000
(Use together with digital multimeter available from
the market with input impedance over 10M/DCV)
Ignition Coil Primary Voltage
Note:
¾ Measure after all the wires are correctly
connected.
¾ Inspection should be done when the spark plug
and spark plug cap are properly installed. If the
spark plug is removed, the peak voltage will
rise.
Remove left side panel. (→2-6)
Keep spark plug in the cylinder head, install qualified
spark plug on the spark plug cap and earth the engine.
Open rubber cover of ignition coil, keep the ignition wire
connected, and connect peak voltage oscillograph
between primary wire terminal and frame body earth
wire.
Special tool
Peak voltage oscillograph
(Use together with digital multimeter available
from the market with input impedance over 10M/DCV)
Connecting terminals: black/yellow (+) –frame earth
wire (-)
Turn ignition switch to the ON position, and start
engine.
Peak voltage: above 150V
9-4
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