Author Topic: CDI - Teardown via Picture, wanna help?  (Read 2767 times)

Offline DuctTapedGoat

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CDI - Teardown via Picture, wanna help?
« on: May 26, 2011, 09:38:24 AM »



So, this is what I'm trying to disassemble with a pic. I can't see every component, and I would really appreciate some help in it.
It's a CDI for a motorized bike, and he wants 75 bucks for it. It's not patented, and I don't want to blow 75 bucks on something that's only 10 bucks in components. Anyone willing to help me diagram it out? It's simple enough, but some I just can't read.


Offline frenulem - No.5417

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Re: CDI - Teardown via Picture, wanna help?
« Reply #1 on: May 26, 2011, 09:50:17 AM »
what is the function of this device? any more pictures?

Offline DuctTapedGoat

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Re: CDI - Teardown via Picture, wanna help?
« Reply #2 on: May 26, 2011, 10:01:28 AM »
Short form, adjusts the spark on a 2 cycle motor.

Here's more info out here from the horses mouth. This isn't a picture I took keep in mind, it's one off his site under installation instructions. And it's the only one I can find.

http://www.dragonfly75.com/motorbike/CDI.html
http://www.dragonfly75.com/motorbike/CDI2.html
http://www.dragonfly75.com/motorbike/CDIinstall2.html
http://www.dragonfly75.com/motorbike/4curves.html
« Last Edit: May 26, 2011, 10:01:53 AM by DuctTapedGoat »

Offline frenulem - No.5417

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Re: CDI - Teardown via Picture, wanna help?
« Reply #3 on: May 26, 2011, 01:02:03 PM »
right so this is obviously not a PCB, just Veroboard/stripboard/whatever you wanna call it, the first thing is working out which way the copper goes

Offline hyper999

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Re: CDI - Teardown via Picture, wanna help?
« Reply #4 on: May 26, 2011, 01:12:09 PM »
I dont think this is stripboard i think its matrix board ( Like This )

or one of those ones with pads in groups of 3 holes or some variation on this, which makes reversing it from the picture very difficult...

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Re: CDI - Teardown via Picture, wanna help?
« Reply #5 on: May 26, 2011, 01:14:12 PM »
I don't think so -  the diode and resistor by jumper/header A almost looks like you can see the wire through it, that or it's a scratch, but I think it's just cheap bread board.

Offline frenulem - No.5417

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Re: CDI - Teardown via Picture, wanna help?
« Reply #6 on: May 26, 2011, 01:19:18 PM »
Time to put this mofo into paint, it says the C106D is a thyristor, looking up the datasheet now
« Last Edit: May 26, 2011, 01:24:57 PM by frenulem - No.5417 »

Offline hyper999

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Re: CDI - Teardown via Picture, wanna help?
« Reply #7 on: May 26, 2011, 01:21:04 PM »
I think your best option is maybe to buy one, reverse engineer it, then sell a couple to make your money back...

EDIT: Is this the same?
« Last Edit: May 26, 2011, 01:25:21 PM by hyper999 »

Offline frenulem - No.5417

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Re: CDI - Teardown via Picture, wanna help?
« Reply #8 on: May 26, 2011, 01:29:59 PM »
yeah, thats easiest, you dont know the values of somethings

Offline DuctTapedGoat

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Re: CDI - Teardown via Picture, wanna help?
« Reply #9 on: May 26, 2011, 01:51:36 PM »
It's another CDI box - but should give enough similar values to be able to process of elimination it out, at least with the resistors.

I'm near tempted to, but 75 before shipping is a lot of money even to start it out with. Gotta register for college when I get paid, and getting all that rolling is going to eat into my check a bit.

Offline hyper999

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Re: CDI - Teardown via Picture, wanna help?
« Reply #10 on: May 26, 2011, 01:54:59 PM »
so the one i posted doesn't function the same?

Offline DuctTapedGoat

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Re: CDI - Teardown via Picture, wanna help?
« Reply #11 on: May 26, 2011, 02:02:30 PM »
Nope - the xt600 was a 4 cycle motor, they fire completely different from a 2 cycle motor unfortunately. It functions relatively the same in that it's designed to discharge the capacitors in the coil to get spark, but with a different circuit sequence.

Offline FOOKz™

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Re: CDI - Teardown via Picture, wanna help?
« Reply #12 on: May 26, 2011, 03:14:17 PM »
I agree to just buy one and reverse it.

I did the same with a CFL bulb's internal PCB and breadboarded it just because I could and it was a cool idea.



Sir, i think you have yourself a bridge rectifier in there and a Logic-Level Thyristor SCR. :)

so when the voltage is switched positive it stays positive, when the voltage is switched negative it turns off.
I don't know much about small engines, but if that kinda makes a bit of sense of what the circuit can do. hyper's link to explain the relationship of the stator and ignition systems show why this is important, just timing.

I guess that this circuit just fires a pulse to the spark plug when the alternator is at a certain point?

what do you guys think

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Offline DuctTapedGoat

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Re: CDI - Teardown via Picture, wanna help?
« Reply #13 on: May 26, 2011, 03:53:51 PM »
Exactly what it does. Essentially this one specifically is designed is to adjust the RPM's powerband as revolutions increase, and with a capacitor upgrade on the ignition coil, have a stronger spark.

 

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