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General => Technical | How To => Topic started by: mjcharger on March 03, 2011, 04:43:18 PM

Title: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: mjcharger on March 03, 2011, 04:43:18 PM

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.

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: axy on March 03, 2011, 06:33:16 PM

Quote from: mjcharger on March 03, 2011, 04:43:18 PM

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.

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: mjcharger on March 03, 2011, 09:45:46 PM

Thanks Axy. Glad thats normal

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: Agent Bob on March 04, 2011, 12:24:35 AM

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.

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: hexnut on March 05, 2011, 02:44:03 PM

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.

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: Cardie on March 09, 2011, 05:09:32 PM

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

Title: Re: Can anyone tell me if their CDI whines/ buzzes when you just turn the key to on?
Post by: hexnut on March 09, 2011, 05:38:16 PM

Quote from: Cardie on March 09, 2011, 05:09:32 PM

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

No, thats the coil that does that...