Roll Your Own CDI

[rohmell]

Found schematics on the Russian motorized bicycle forum:
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for the CDI, so I'm going to start experimenting, looks very simple and can be tailored for use with any old ignition coil you have lying around.

[Skarrd]

do you know if this one will perform ignition retard? or does this one just keep advancing like our stock ones do?

[corgi1]

Oh my did you just call him a retard,this is too much ,I have to get some sleep,lol

[The 26incher]

lol.......

[Skarrd]

Originally Posted by corgi1

Oh my did you just call him a retard,this is too much ,I have to get some sleep,lol

LMAO XD nice one.

[rohmell]

The 2nd schematic uses a pot which will allow you to vary the timing manually.

[DaveC]

The CDI that banned member jaguar makes automatically retards at upper RPMs. There are two jumpers to pull to further tune the CDI if desired.

I can give you a link if you PM me.

I use it and I can tell you first hand it works to lessen vibration in the upper RPM band. My motor has never run smoother, especially for a 66cc. The Puch cylinder head has stiff compression, about 9:1 compaired to the stock 6:1 compression ratio and the CDI fires under those conditions very well. Plug is not quite right with a B8HS but I got my NGK BR9HIX Irridum sparkplug today, right from NGK

Now I gotta plug the hole at a mounting stud weld on my tank Re-adjust the clutch and back to riding

[Skarrd]

Originally Posted by DaveC

The CDI that banned member jaguar makes automatically retards at upper RPMs. There are two jumpers to pull to further tune the CDI if desired.

I can give you a link if you PM me.

I use it and I can tell you first hand it works to lessen vibration in the upper RPM band. My motor has never run smoother, especially for a 66cc. The Puch cylinder head has stiff compression, about 9:1 compaired to the stock 6:1 compression ratio and the CDI fires under those conditions very well. Plug is not quite right with a B8HS but I got my NGK BR9HIX Irridum sparkplug today, right from NGK

Now I gotta plug the hole at a mounting stud weld on my tank Re-adjust the clutch and back to riding

still trying to figure out what he actually changed on the cdi. i got the schematic for the standard kdx200.


also why'd he get banned?

[DaveC]

..getting into confrontations with the mods. To the point of them pulling his posts.

I disagree with many things that go on in forums but I like to help people so I usually bite my tounge. I have fired what I call broadsides at people when I think there's an injustice. Gotten threads locked but never banned until I was on the other MB forum and got banned for not doing a search for someone else :/

I can find him if I have to and I do, I want another ignition box for the racer I'm building

[rohmell]

Some more information about his CDI:
Repairing the KDX CDI