Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?

[mjcharger]

When I turn the key to on, I noticed my CDI makes a high pitched whining sound with kind of a buzz sound mixed into it. Can anyone put their ear to their CDI and tell me what they hear?

Thanks everyone.

[axy]

When I turn the key to on, I noticed my CDI makes a high pitched whining sound with kind of a buzz sound mixed into it. Can anyone put their ear to their CDI and tell me what they hear?

Thanks everyone.

The same.

[mjcharger]

Thanks Axy. Glad thats normal

[Agent Bob]

That high pitched whine is an oscillator that converts your 12v battery voltage to alternating current and applies it to a transformer and rectifier to step it up to a high DC voltage and charge a capacitor. The capacitor discharges into the coil to provide spark. Google CDI for a more deatailed description.

[hexnut]

I don't hear my CDI, but then I don't stick my ear to it...I do carry an extra CDI in the tool kit for both my scooters. They do go out. My other scooter is a Honda Passport/Fly Scout hybrid.

[Cardie]

Basically 12v turning into about 30,000 volts, gonna be some sound there

[hexnut]

Basically 12v turning into about 30,000 volts, gonna be some sound there

No, thats the coil that does that...