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2003 RM 125 Stator Ohm values
Posted October 28, 2010 - 07:33 PM
Resistance on coils 26.7 Ohms and resistance on Pick up is 106 Ohm. Can any one tell me what they should be? 2003 RM125
Posted October 29, 2010 - 07:06 PM
Also test the kill switch and it's good. For those that don't know how to test it you can simply unplug it.
Ohm test improved resistance by .7 ohm
Tomorrow I'll reinstall the old stator and reconnect everything using di-electric gel.
We'll see what happens tomorrow. Ordered a Service manual on Ebay too.
Edited by oldrm250, October 29, 2010 - 07:11 PM.
Posted October 30, 2010 - 07:25 PM
The key here was re-soldering the stator to the harness. I noticed the manufacturers solder connections were weak- my ohm reading was going up and down while I wiggled the wires during testing.
Total repair cost $ .50 ( 1 roll of black electric tape)
Also, I used plenty of dielectric gel thus making most of my connections waterproof and less likely to arc. Good luck.
Posted October 31, 2010 - 05:21 AM
Red/white-black/red 18-30 ohm
green-red 75-125 ohm
Your values are right.
If you want I have also the manual for this bike.
I have a 92 rm 125 and two different stators (the original and a brand new), I took this readings:
original 3,9 Mohm, pick up 104 ohm
brand new 127 ohm, pick up 103 ohm
But there is no spark with all of them. Can you explain to me how you test your electrical system? Should the values be similar to yours?
Can be the ignition coil? Thanks
Posted October 31, 2010 - 06:16 PM
Check the two leads ( each ) to the ground, If you have any value at all, that's not good.
Make sure the ground is absolutely clean. It's on the stator housing. Disconnect it and hit it with 400-500 grit sand paper.
Arcing- leave nothing to chance. I sealed all the wires coming out of the stator coil with RTV Silicone High temp.
I think mine was failing because of arcing- measuring resistance is no help here.
Posted November 01, 2010 - 06:58 AM
I read 14-17 volts and more on the meter, like you do, but no spark on the spark plug. So is the stator good? Probably is the ignition coil but I have also bought another one and there is no spark. Tere is only the CDI unit, but I don't have the manual to check it.
I don't know what can be...
Posted November 01, 2010 - 05:45 PM
After you fix this one, always test backwards. Unplug kill switch, Test the coil resistance, test the rectifier, test the stator.
Another way to test is with a 6 volt/12 volt circuit test lamp. Super easy and fast. One end is a clip ( ground) the other end is like a sharp as hell needle and lamp you jam into the wire. Do this while someone is cranking. It puts a tiny little whole in the wire- no big deal. You will discover power or not.
When mine died I checked it with my light test/ voltage tester and worked backwards to determine it was my stator.
So, I got lucky, I bought a 2003 RM 125 with a bad stator, new top end, new suspension, great tires, new sprocket and chain for $800.00
I've got a $1500.00 bike now- well my son does.
Posted November 02, 2010 - 12:10 PM
Do you know if there are other models that use the same CDI? I found several RM250 and RM85 cdi at very good price.
I try to test between ground and the wire comed out from CDI (that goes to ignition coil). Do I have to test on DC or AC? After your explanation I thought on DC but there is no voltage when testing. So I tried on AC and there is only a small voltage, about 0.50v when cranking.
I think that probably the cdi doesn't work well and doesn't convert AC to DC. Can you confirm it?
I tried to use a circuit test lamp (with a 12v lamp and even with a 6v lamp) but there is
no light even if I read on the meter about 15v. Maybe I did something wrong.
You are very lucky (and smart), because you have found immediately the problem. I bought a new stator, but probably it is not the only trouble!
Posted November 02, 2010 - 05:44 PM
And, you're too kind. Being from Italy, you probably have 3 or 4 languages that you can speak and/or write well. Let's see- Italian, English, Spanish, French and probably some German. Me, English and bad Spanish. (And of course the Hot Danish girl friend I had for 4 years). So, you're the smart one.
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