Attempting to build my own CDI box......input?

[XL-erate]

I stumbled across an old electronics hobby builder book several years ago and it had directions for building an automotive CDI, looked very simple. I think it was by Tab books? Unfortunately somebody stole it from me I think, but I'll look again. I saw some designs on the net for DIY CDI's too.

Another thought is to just do some patent research. Anything patented has specific instructions on how to build it included in the patent application description. Not suggesting you pirate somebody else's stuff, but lots of the 'NEW IMPROVED' things you see everyday are a result of getting creative with someboody else's patent. Actually it's not illegal to BUILD something that's patented by someone else, just illegal to copy it and sell it.

[XL-erate]

You may find some related info at the link. Scroll down the page, lots of stuff there.

http://members.aol.com/pullingtractor/ignition.htm

[Yamada]

Any update???

[Tecate250]

Why can't you use another cdi box off something else? Some cdi boxes need to be ground out and some ground out at the stator plate. I think a tecate 3 and tecate 4 cdi box will work Like I said above. 3 wire 4 wire.

[junkrider]

It looks like a great idea. Do you have a signal generator and a scope? You could easily simulate the pulses from the induction circuit and monitor the output, timing and all.

I've considered this same thing (building my own). I've got a bunch of CDIs I'd love to characterize, but I'm just too busy.

[Billy Golightly]

Since TeamGEEK is gone now, I'm curious if any headway was ever made on this?

[Curtis-Tecate3]

If anyone is interested in high end ignitions the 125cc shifter kart guys were doing all kinds of stuff with programmable ignitions on CR125 based engines a few years ago and likely still do...

[unclebernie]

Ok, I am new here, but from the info I have found, the 82-85 KLT chassis machines are terrible for their CDI boxes. I found this thread and thought I would help(if I can). I found a site where they are replacing the CDI with a GM HEI module.
http://www.kawasakimotorcycle.org/fo...you-300-a.html
This wroks, as I did it to my Prairie 250 an hour ago. I have not got it mounted yet, or hard wired for that matter, but i will say it works. Now from what I read the older machines timing curve is not cdi controlled, so this should work for them. Now on Kawi's website it lists the same CDI # for the KLT 200 and 250chassis from 82-85 also the KZ 250 81-83 and the Bayou 300 86 &87 only.

My wiring plug goes as such, yellow/red blk/yellow red
blk green

Wiring the GM module is only using 4 wires. yellow/red: hook to B
blk: hook to C
red: hook to W
green: hook to G
And be sure to ground your module. Hope this helps, and give me some time, and I will snap a pic of it when I get it mounted and wired properly.

John

[unclebernie]

here is a pic of it wired up, hope this helps!!!!!!!!!

[unclebernie]

Update......although the trike runs, when test riding it today, when it comes down to an idle, it will fire early during a power stroke and kill the engine. It sounds very bad too. It seems it is too advenced in the timing department. So back to looking for an expesive replacemnt CDI........

John