NSR 125 no spark

[seevin]

Hey, I have no spark in my 2001 NSR. I've changed the alternator, impulse coil, ignition coil, spark plug cap, CDI and a spark plug of course, with no effect at all. I measured the resistance everywhere where possible and it was fine (according to the manual). I also measured the voltage given to the CDI while running the starter and I recieved ~60V AC (which, according to what I've already read here is ok).
I' ve had 2 CDIs - CI572 (which was in the bike when the spark disappeared) and a CI639 (which might have been faulty).
I have no spark on both, but the voltage given to the ignition coil (measured between the yellow/black and green wires) is about 60V on CI572 and only about 25V on CI639 (that's why i think it was broken).
I checked all the wires in the installation and they are fine. I tried pulling off the white/black wire from the CDI - still no spark. I checked if there is ground on the cylinder head and it is there.

I've also noticed something strange. There was w while when I had spark (I don't know why). It was on a CI572. It was light blue and was sparking in good timing. BUT, when I plugged in the RC valve control unit (TV-124) it disappeared. Then the voltage on the ignition coil wires was lower - about 35V. After unplugging the unit the spark was back. Also, another strange thing was the tachometer. When i tried pushing the bike on the second gear with the ignition switch ON, the tacho was showing crazy values (eg. 10k rpm, which is totally impossible). After a few tries the spark disappeared.

I will probably get a new, 100% working CI639 and try if it works then.
But I am curious if something in the installation is burning the CDIs. Is this possible? Could it be the reg/rec? Or maybe the RC valve control unit is broken and it damages the CDI? How can I check it?

Aha, it would be nice if I introduced how it all began. Nothing special, I was riding as always and suddenly the engine turned off. I managed to start it a few times after that, but it eventually went off again after a few seconds. It finally turned off with crazy values on the tachometer, which I have already mentioned.

Sorry for the amount of text, but I wanted everything to be clear.

[Stowelly]

could be the stator. had this problem on mine and had tried everything you mention. found a 2nd hand one on ebay for about 20 quid

[seevin]

Sorry, but where is the stator? How does it look like?
EDIT: I googled it and got this: https://img27.imageshack.us/img27/6202/img0122ktt.jpg
Is this what you're talking about? If yes, I have already changed it

[Stowelly]

yeh thats the bit.

hmm im assuming youve been through alains guide? there is a step by step on debugging ignition faults. does seem like you have covered everything though from memory. if you havent checked it you should search for that doc and run through it

[seevin]

I've studied the NSR tips already. According to this guide, my CDI is broken - and that's also my assumption. But who knows...that's why I asked here. I'm afraid that my bike destroys the CDIs and that this one will die too. Is there any way to check it? The voltage doesn't seem to be too high and I haven't had any problems with charging, burning the light bulbs, etc., so I guess the reg/rec is ok as well. What do you think about it?

[alains]

it seems that your bike is a french import , give me your serial number (may be you call that VIN) . it begins by ZDCJC22.......... and if it's a french bike the caracter should be a "B"
then i may help you
____________________
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[seevin]

Problem solved! I bought a shit CDI which didn't work - now I've got another one and everything works fine. Thanks for your help guys!