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Message started by japes on 08/22/13 at 15:17:45

Title: CDI
Post by japes on 08/22/13 at 15:17:45

I have had had two CDI blow due tohigh current throught the power transistor when the battery voltage gets low - when trying to start the bike, I think! I have paid lots of money to get

two new CDI and they have blown also. I repaired both CDI's with new power transitors and they also blow. I have

decided to make my own CDI.
Does anyone know:
1/ The Ignition Advance Curve for the LS650
2/ The position of the Pickup Coil/Pulsor Coil relative to Top Dead Centre (TDC) e.g. maybe 36 degrees before TDC.
3/ Is the pulse from the Pickup coil positive then negative or negative then positive
4/ The rev range of the LS650

Title: Re: CDI
Post by mjs3790225 on 08/22/13 at 15:59:47

I actually threw my pickup coil on an oscilloscope the other day. I believe it was positive then negative. I would have to double check to be certain though.

Still, if you are blowing your ignition controller so often, I'd be wondering if there isn't a problem somewhere else. Seems kind'a odd.

In most of our controllers, when the battery voltage gets low, they just stop working. I'm not certain if a voltage drop would cause your problem, unless there is some sort of odd race condition. I can't recall it ever being reported on here before.

Title: Re: CDI
Post by mjs3790225 on 08/22/13 at 16:09:19

Maybe you have a bad current limiting resistor going into the transistor? If its not protected to a safe range, it could be failing that way. Trace the leads and see where they go. Then probe the resistor and see if it matches the correct spec on the bands.

Title: Re: CDI
Post by Steve H on 08/22/13 at 20:09:40

Maybe a bad coil drawing more power than it should?