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2008 stator headache

808 Views 10 Replies 3 Participants Last post by  dannoxyz
Good day
A little back story I’m rebuilding a bike that was crashed and my build is almost complete I’m just having a weird charging issue. I put a new stator in and when testing directly from the stator leads if there is any current coming through I get no reading with the old lightbulb trick. Although the stator passes all the static tests. I then got it swopped out at the shop and I have the same issue. My guess is it must be the fly wheel but the fly wheel is very magnetic how it’s supposed to be
So I am completely lost on what to do or check.
could it be that the stators were wounded wrong ?
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Stator only has voltage with no load and plug disconnected from RR.

Most likely RR issue:

1. what is battery voltage at idle?
2. what is battery voltage at 3000rpm?
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RR may be bad if it's not providing sufficient voltage, even though stator may be perfectly fine.

You cannot test current through stator because it is AC. Unless you use very expensive AC clamp-on meter. No current flows because stator is disconnected from RR for testing. Light bulb test irrelevant because it's not same load as powering entire bike. It may light tiny bulb, but may not even charge tiny flashlight battery.

You have to do these tests with stator, all disconnected from RR.

1. resistance to ground of each yellow wire

2. resistance between yellow wires: A-B, B-C, C-A
(better to measure inductance in milli-henrys)

3. engine at idle, voltage AC between yellow wires: A-B, B-C, C-A

4. engine at 3000rpm, voltage AC between yellow wires: A-B, B-C, C-A

The measurement to make is voltage AC, not current.
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Do "the drill" test procedure here and post numbers you measured for each step.

Another article on testing stator. Measuring VAC is most important test. It's bottom-line in-the-field test of actual functionality.
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I did the AC volatage test. I figured out the issue tho. The motorcycle shop kept giving me CBR1000RR stators even tho its the same size and stuff and fits it wasnt working. I put a 600RR one on and it works now
Was a very silly issue
Thanks so much for the help
You're welcome! Did CBR1000RR stator test differently with different numbers than working 600RR stator? They were probably giving you used and defective stators.
Glad you figure it out. So the question remains...what's the difference in the two stators? PIN Connectors/wiring color code different?
Depending upon generation, some CBR1000RR stators are slightly smaller in diameter. So may not have as close contact with magnets and generate less output. But ones with same diameter will work exactly same. Some connectors are different, but best to chop them off and tie/solder/heat-shrink wrap connection between stator & RR anyway due to factory connectors being low-spec with uncoated terminals that corrode.

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Odd, here's roughly 2 different types of stator windings: wye/star and delta. Wye/star winding is used for both as far as I can tell which favours higher-voltages at low-RPM. Delta windings favours higher current generation.

Did you measure differences in VAC output between the stators?
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