Re: No Spark - HELP!

"Jim Ingram" <ingramja@xxxxxxxxxxxxxxxxxxx> wrote in message
news:newscache$1r72qi$eh8$1@xxxxxxxxxxxxxxxxxxxx
>
> "Pale Fire" <h_leucocephalous@xxxxxxxxx> wrote in message
> news:1131994997.951545.315440@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>
>> Patti wrote:
>> > I can't get a spark on my 85 XL600R - I replaced the pulser, CD
> unit,
>> > coil, sparkplug, and everything else (except the voltage
> regulator) in
>> > the ingition circuit. What the heck?? I wonder if the ignition
> on/off
>> > switch could be faulty? What should I look for? I have the
> sparkplug
>> > out and clipped with big bulldog clips to the frame and there's
> no spark
>> > when I kick it.
>>
>> Disconnect the connector coming from the alternator stator and kick
> the
>> engine over as fast as you can while observing the output voltage
>> across the red and black wires.
>>
>> I suppose you would need an analog voltmeter to see the voltage
> jump up
>> and fall back down. A digital voltmeter might be too slow to
> respond.
>>
>> I dunno for sure what it will be, but I would expect at least 50
> volts.
>> That's the supply voltage for the CDI. When the pulser coils fire,
> the
>> ignition control unit suddenly hits the ignition coil with voltage,
> the
>> coil multiplies the voltage to a higher level (maybe 20KV?) and the
>> spark plug fires.
>
> Are you sure? I thought the primary circuit was connected to +12V
> except when the signal from the pulser coil is used to break the
> primary circuit causing the electromagnetic field to collapse
> inducing a high voltage in the secondary windings. In my (not that
> extensive experience) I would expect 12V on the positive coil
> terminal (the negative is usually green IME) as soon as the ignition
> is turned on. It should be apparent from the wiring diagram.
>
> Jim

I am thinking maybe there are a set of ignition modules on the
bike....have you tried replacing those???

Fwed


.

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