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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,213
Electronic flash units for camera's make a rising whine as the capaciter is charged.
The whine is from the thyristor which charges and controls the output of the capacitor and duration of the flash.

I would guess the whine in a CDI is also the thyristor.
so if it still whines and doesn't put out the 350+ volts to the coil that it is supposed to do, then the capacitor is probably shot and leaking voltage internally.

Take out your upside down mounted coil and see if any brownish oil has leaked out between the aluminum housing and plastic tower and stained it there.
That is what mine did recently and the dead bosch coil was only a few years old.
Old 07-11-2008, 06:42 PM
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