Possible rotor failure - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
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post #1 of 12 (permalink) Old 04-13-2018, 07:19 PM Thread Starter
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After replacing my stator my bikes not charging. When I checked the first stator it had high resistance on one leg and almost no output on that leg. I did the tuxedo mod with the premade plays and that went smooth. Made sure there was no contact during the install. Now the stator tests at .5 ohm between all three legs. When running I'm getting about 11.75 v at idle and 33 v at 4k rpm at the three yellow wires. I'm figuring that if the stator tests ok which I think it does then maybe my problem is weak magnets in the rotor. The bike is an 89 with about 11k miles if that makes a difference. If anyone had another idea I'm open to suggestions before trying to tear open the engine and replace the rotor.

Last edited by Andeo1025; 04-14-2018 at 12:38 AM. Reason: Autocorrect
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post #2 of 12 (permalink) Old 04-13-2018, 07:28 PM
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Could be a failing Rectifier....what charging voltage do you get at around 3Krpm with a battery connected?? test the voltage across the battery when checking this.
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post #3 of 12 (permalink) Old 04-14-2018, 12:10 AM Thread Starter
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I got about 12 v even. The previous voltages from the stator were measured with the connector disconnected so there was no load. I tried three different regulators just to check. There was no difference between the three.
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post #4 of 12 (permalink) Old 04-14-2018, 08:24 AM
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no load the stator should be putting out considerably more voltage than that at 3-4k.. many people see 60+ volts AC across the legs without the regulator attached

also, its extremely rare for the rotor to fail, but not impossible of course

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post #5 of 12 (permalink) Old 04-14-2018, 10:30 AM Thread Starter
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Yeah I'm just not sure why the voltage is low. If there's a problem with the stator I'll call the rebuilder and see what I can do but I figured if that was the problem it would ohm out wrong.
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post #6 of 12 (permalink) Old 04-14-2018, 11:27 AM
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Originally Posted by Andeo1025 View Post
Yeah I'm just not sure why the voltage is low. If there's a problem with the stator I'll call the rebuilder and see what I can do but I figured if that was the problem it would ohm out wrong.


The stator output is low, should see 50-70v ac.

You could check to see if the magnets on the rotor still have a relatively strong amount of pull. Drag something around the inside to see if there's a weaker spot. It's not unheard of, for magnets to just lose their field, but we just haven't seen it on this engine. I've seen it happen on some automotive distributor shafts, not losing it completely, but being very weak. Rotor replacements have usually been from damaged magnets on a failed tux mod, or warping from improper removal.

Shock, hammering on magnets can cause them to lose their field, along with extreme heat.

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post #7 of 12 (permalink) Old 04-16-2018, 02:04 AM
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Just checking, but when you tested, did you disconnect the R/R or backprobe it? You should test with it disconnected to use the specified readings. I've never seen a rotor failure on this model, but I guess it could happen.

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post #8 of 12 (permalink) Old 04-16-2018, 08:44 AM Thread Starter
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I disconnected the plug from the r/r when l tested it.
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post #9 of 12 (permalink) Old 04-16-2018, 07:13 PM Thread Starter
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Well I opened up the engine today and found part of the rotor had delaminated and was hitting the stator.
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post #10 of 12 (permalink) Old 04-17-2018, 01:30 AM
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Quote:
Originally Posted by Andeo1025 View Post
Well I opened up the engine today and found part of the rotor had delaminated and was hitting the stator.
Wow ! ....that's a first (for me anyhow).

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