Quote:
Originally Posted by TWJ
The hum doesn't change with engine RPM, it's just a constant noise/hum.
Does that help?
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Then it is either internal to the radio (unlikely) or it is coming from the inverter circuitry in the CDI.
In addition to all the above good suggestions, try improving the grounding of the CDI and the electrical panel. Put a noise suppressor in the power lead to the CDI.
Try a different CDI.
Best,
Grady