NSR 125 JC22 Electrical Problem.[SOLVED]

[Alaahel]

Hi everyone !

So I have a NSR, which worked well for a while, but now I have a weak spark and it won't charge either.

I had a few spares, so I replace the stator, regulator rectifier and put in a new battery. No changes.

If this helps, when the bike is idling, I get about 10-12 volts from the 4 pin connector off the stator, between the yellow wires and ground. This drops to almost nothing when reving the bike up.

I've check all the resistance and everything is within normal ranges.

Anyone has any idea ?

Thanks

[Val]

[alains]

the stator has 9 coils as : 3 in serial and connected like triphased in Y it provides after rectifier 14.2VDC at 5500 rpm
it has also 2 coils (bigger than the 9 others) in serial to provide the charge of the CDI's capacity Under 200VAC at 5500 rpm
the thing to keep in mind : ignition is separated from the provided energy
if the battery is not charging this is from the 3 yellow wires . but you should read about 19VAC between yelows before rectifier
take mesurement between a yellow and the 2 others
the stator is the weakest part on the NSR , but if necessary you should find spares on eBay . just pay attention at coils number , must be 11
____________________
the worst day fishing is better than the best day working

[Alaahel]

Hi guys,

Thanks for taking the time and your responses.

Ok, so back with a bit more testing, following your advice.

I get 8-9 volts AC from yellow to yellow (all pairs) when the regulator rectifier is connected and it drop when reving. With the rectifier unplugged, I get about 11-13 volts on each pair at idle and then it goes up to about 35-40 volts at 5000 rpm.

I do have a spare stator, which gives the same range of results.
It could be unrelated, but I also noticed that when I put the indicators on, the servo motor twitches a little bit.

Which to be honest I have no clue on how this can happen.

[alains]

when a battery is worn this kind of bug appears . when the battery is connected the voltage is 14.2 VDC
charge your battery with a charger then check voltage when you unplug (if less than 12.6V battery worn) , wait 2 hours then check again (if you've lost more than 0.2V battery is worn)
BATTERY IS PART OF THE CHARGING SYSTEM
if bug remain try an other reg/rec but you should think about loom exchange if you find the right one for your model
____________________
the worst day fishing is better than the best day working

[Alaahel]

Well the battery is new and hold its charge so I guess it's time for a new loom !

Thanks Alains for your time and help, on this occasion but also countless other time I was looking for info on my beloved NSR

[Alaahel]

If anyone has similar symptoms, I found what was my problem.

In hindsight it's probably something I should have checked first, but I checked the positive wire (red) that goes into the RR for continuity with the positive battery terminal and found a resistance of 600 ohms or so.

Although the first thing we check is the stator, battery and RR. There is a connector where the start switch, fuse and RR wires meet, it's a simple crimp, which looks a bit like the picture shown. I'm guessing with the vibration, moisture etc, it can weaken and break off.

Anyhow, glad to finally have found the answer
https://www.madelectrical.com/electricaltech/images/remote3.jpg

[stirlinggaz]

[Alaahel]

It's located between the two diodes on my loom, although I guess it may vary slightly.

[stirlinggaz]

[Alaahel]

lol, hum... Between the connector coming from the stator and the one going to the RR.