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  1. #61
    Myself's Avatar
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    With coils unhooked from the cdi. Just slip the lead ends into the connectors. Black with white stripe out of the cdi is the coil positive, black is coil negative. Meter set on ac volts auto ranging. While cranking the cdi tries to send around 14 volts ac out to the coils. Apparently while hooked up in series and producing nice blue spark, it takes most of that voltage to operate the coils.

  2. #62
    Click avatar for tech links/info K447's Avatar
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    Where are you connecting that the measured result is in millivolts?

  3. #63
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    Same place but with coils hooked up in series as they should be. With all three hooked up you will only see millivolts as the coils are using the rest of the power I assume.

  4. #64
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Myself View Post
    Same place but with coils hooked up in series as they should be.

    With all three hooked up you will only see millivolts ...
    Something is not making sense. It might be your use of AC mode on your meter.

    What comes out of the CDI (to drive the ignition coils) are strong voltage DC pulses. The individual DC pulses are very short duration, maybe milliseconds.

    A new pulse occurs every time any cylinder needs spark. At 600 cranking RPM (on a three cylinder Fuji engine) that would be 1800 CDI pulses per minute, 80 per second.

    If your meter cannot respond quickly enough it may not be able to show what is actually happening.


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