Key ignition - what cdi lead to interupt to prevent ignition

chilledspode · Feb 22, 2007

Hi,

I have a KTM ignition that has only on-off and has two normally open contacts when OFF - both are closed when ON

I am not that good at electrical but I have determined that I am going to cut into the primary red/yellow wire off the fuse block to interupt the starter relay circuit and all other battery circuits.

My problem is, I don't have a clean way to stop someone from kicking the thing to life and riding away. The normal ignition kill is to take the CDI yellow/blue to ground but I can't do that easily with the switch I have because OFF is open for both contacts.

Can some one help me choose which CDI lead to or altenator wire I should interupt to prevent kickstarting

Cheers

Mark

sparks · Feb 23, 2007

Re: Key ignition - what cdi lead to interupt to prevent igni

Hi Mark,

Take a wire from one side of the switch and put it to ground (frame) take the orange lead from the cdi to the other side of the switch when in the off position this will interupt the ignition circuit by grounding it out. Hope this helps.

Sparks.

chilledspode · Feb 23, 2007

I am at the office so I don't have the wiring schematic in front of me, but if I understand what you have written, I am puzzled...

When the switch is OFF both contacts are open and therefore I can't see how you could ground the CDI circuit in the OFF position...

Am I missing something?

Thank you for your help in this

Mark

sparks · Feb 23, 2007

If thats the case Mark then the only thing I can suggest is take the green wire from the stator to one side of the switch and to the cdi from the other in the off position the should stop the engine.

Regards

Sparks

chilledspode · Feb 23, 2007

Hi Sparks,

Is there any down side to doing it the way you suggested? If there is a risk to the CDI I would probably opt to hide a deadman switch which would ground the yl/bu CDI lead

Cheers

Mark

sparks · Feb 23, 2007

The only down side to this would be if the switch got worn and you end up with intermittent good bad contact.
Is there an after market ignition switch that has continuity when turned off this would be the easiest solution if one was available.
Failing that a dead mans switch like you mentioned would work.

Regards

Sparks.

chilledspode · Feb 23, 2007

It would seem unlikely that a switch would have a set of contacts closed when OFF, but I will look into it.

The switch I purchased was from a 05-06 KTM SMC which should be wired similarily, I would think and is the reason I bought it, along with the SMC key barrel mount bracket. I need to revist that bikes wiring schematic and see how they solved this problem - maybe the SMC is wired as you suggested....

When I know how KTM handled it for the SMC's I'll post

Thank you

Mark

chilledspode · Feb 24, 2007

Hi Sparks,

I figured out the difference - it appears the SMC's have a 12v source to the CDI and they use the second set contacts in the key to kill this CDI circuit. I am assuming that with this circuit (orange) interrupted the CDI will not function either on battery start or kick start.

In reviewing my hardware I think using the key to interrupt the CDI circuit (GR) as you suggested is my best approach.

Thank you, I could not have figured this out without your help.

Mark

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