Author Topic: IT400C CDI UNIT  (Read 1847 times)

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Offline Spudly

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IT400C CDI UNIT
« on: December 09, 2017, 05:54:23 PM »

I am sure this problem applies to others as well, so here goes.

Many years ago I purchased a new replacement CDI and tucked it away in the garage in Ft. Lauderdale Florida.

Well here it is some years later and I dig it out and the potting has turned soft and melted. I placed it in a dish and let the rest of the potting compound drain.

Ideas on a good next step and beyond?

Offline fred99999au

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Re: IT 400C CID UNIT
« Reply #1 on: December 09, 2017, 10:21:28 PM »
Prolly gonna get more love on an electronics forum, but I suspect that Bill might be able to advise what to replace it with.

May need to clean it with Isoropyl alcohol first to get the remnants of schmoo off the components. Then take many photos or send it to Bill for analysis...

Online Martin I Henry

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Re: IT 400C CID UNIT
« Reply #2 on: December 09, 2017, 11:57:47 PM »

As Fred Nines said.

Contact Bill : http://www.dynotronix.com/index.html

I would love to see a photo of a melted IT400C CDI please !

Cheers,

Dave R.

Offline DynoTronix

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Re: IT400C CDI UNIT
« Reply #3 on: December 10, 2017, 05:10:38 AM »
As someone once told me, everything will rust in Florida. :)

Is this an OEM CDI?  What you're describing sounds like an ozone attack on the potting compound.  Suggesting a solvent to clean the gunk depends on the potting material used, i.e. urethane, silicone, etc.

I don't have a CDI for the 400C, (Yamaha 445-85540-22-00), but it might be close to our CDI-1W4. 

If you're interested, you can send the CDI to me and I can try to repair it, or maybe make a replacement.  You can contact me directly at, support@dynotronix.com, and we can discuss the details.

Regards,

Bill

Offline Spudly

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Re: IT400C CDI UNIT
« Reply #4 on: December 16, 2017, 04:46:28 AM »
Sorry for the delay, will try to post some pics of this OEM CID.
I don't think it needs repair.
For now just want to clean it well,test and repot.

Online Martin I Henry

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Re: IT400C CDI UNIT
« Reply #5 on: December 16, 2017, 07:00:26 AM »
Quote
Sorry for the delay, will try to post some pics of this OEM CID.
I don't think it needs repair.
For now just want to clean it well,test and repot.

It would be good if Bill could at least see the electronics so he can gain some insight into how it works.

I would be looking to purchase a spare CDI for my IT400C at some point in the future. At 42 years old + already, I can't see the original lasting much longer !

Cheers,

Dave R.

Offline DynoTronix

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Re: IT400C CDI UNIT
« Reply #6 on: December 16, 2017, 08:23:19 AM »
Dave,

The OEM 445-85540-22-00 is probably close to the 1W4 design.  The 1W4 CDI came out in 1977, and covers the 1977/78 IT line.  The biggest difference I see is with the connectors, which are molded plugs on the 76 model.   There may be some timing differences too, but I won't know that until I reverse engineer one.

Regards,

Bill

Offline Spudly

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Re: IT400C CDI UNIT
« Reply #7 on: December 23, 2017, 06:29:33 AM »
Again , sorry it took me so long to get back to this.
Just after first post I went to the hospital and am just now coming back.
The CDI was new so I would think it works. I just need a good way to clean everything up. Then I will swap it out on my running IT and see. If it still works then a repot.
I have attached some photos so everyone can see what I am dealing with.

Offline DynoTronix

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Re: IT400C CDI UNIT
« Reply #8 on: December 23, 2017, 07:01:16 AM »
It looks like ALL of the potting came out.  From what I see of the circuit, this CDI isn't even close to the 77/78 units.  I'm thinking that whatever caused that potting to turn to liquid probably also destroyed the electrolytic capacitor that can be seen in the photo. 

Regards,

Bill

Offline Spudly

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Re: IT400C CDI UNIT
« Reply #9 on: December 23, 2017, 07:19:05 AM »
I have some more photos.
The CDI was just sitting in the garage max temp 105 F min 45 F.
So we are  talking  into the trash ?