Cheap CDI

UPDATE:
Bad news. While removing the plastic plug casing to expose more of the pins to solder jumpers to, I accidentally snapped off a pin. Since the whole thing is filled with epoxy, it's impossible to even dig it away to expose enough of the pin to solder to. This might be a good sign to follow more experienced people's work on these...
 
Do you have a dremel tool so you can grind away at enough of the epoxy so you can solder a lead onto what was running to the pin?

Good luck
rc
 
I tried that. Then I started nipping away at the case itself and found nothing. It was a lost cause and a waste of $6 on my part. I couldn't find the wiring harness I needed as soon as I wanted it and rushed things. I hate ruining things that could have been something. Oh well, c'est la vie...
 
Some potting compounds can be softened with MEK. If you have some lying around, you could let the CDI soak for a while in some MEK.

I would mention DMSO, but I won't, that stuff will eff you up.
 
I don't have any of that lying around unfortunately. Maybe I'll keep chipping and gnawing away at it until I find something recognizable. I'll definitely have to excavate the components.
 
Ok. Round 2. I decided to give it another try before I build my own CDI. I bought a cheap racing CDI that looks almost identical to the JN Motors unit. How do I hook this up? I'll be using a CR80 iginition coil with it as well. It has 5 wires which are all red and black...Any help?
 

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Ok thanks. So the orange and black go to the positive and negative (respectively)on the coil, the black wire on the left in the pic is ground? and the other 2 go to the black and blue wires from the engine? Obviously I'm guessing here...
 
What a nice looking cdi, skrew!
probably better looking than most could build at home.
As DTG said, there's an orange, a red with a stripe, and one of the blacks is paired with another wire.
Seller really has a responsibility to provide you with a diagram, IMO.
Otherwise, 'Thevenin's Theorem' it is, for reverse engineering.

What was your source?

I'll look forward to seeing your running results posted!
Best
rc
 
Well, no.

I would do this personally.

Orange/Black - To Coil.
Black Motor - Black CDI.
Blue Motor - x1 Red CDI.
White Motor - Wire Cap.
x1 Red CDI - Wire Cap.


Please, if anyone knows why this isn't a good way to wire, speak up. Seems to me this is how I would try though.

Note though, you could prolly wire a tachometer to the other red wire no problem at all.
 
rustycase said:
What a nice looking cdi, skrew!
probably better looking than most could build at home.
As DTG said, there's an orange, a red with a stripe, and one of the blacks is paired with another wire.
Seller really has a responsibility to provide you with a diagram, IMO.
Otherwise, 'Thevenin's Theorem' it is, for reverse engineering.

What was your source?

I'll look forward to seeing your running results posted!
Best
rc
Click to expand...

I got it here:
2 STROKE RACE CDI IGNITION JOG Minarelli 1PE40QMB | eBay
There are 5 left.
 
I received an email from the merchant with the wiring diagram. I'm still a little foggy on the connections, keep in mind I'm still learning. Here's what they sent:
 

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Blue from motor goes to EXT.
Coil goes to IGN.
Kill switch goes to SW.
Black from motor (Ground) goes to E.

It shows PC going to ground, but I would cap it and leave it alone.
 
Thanks! Now I just have to wait till it gets here. In the meantime, I need to check for some air leaks and build a new tank bracket which snapped from vibrations this weekend. Maybe I'll use steel instead of the aluminum strip I had laying around.
 
You're welcome - now of course, that's just after a 30 second glance at the attachments you posted, I could be wrong, but it seems to add up.
 
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