Stator failure? Urgent advice needed. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 01-13-2015, 06:28 PM Thread Starter
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Stator failure? Urgent advice needed.

Hi all... I already put my bike up for sale 'cause I don't have money or time to fix the stator. However, I just remembered something the bike did and made me guess my diagnostic.

So the bike won't start. Has been sitting for a loooong time (maybe a year) but the carbs were taken off (and cleaned) and the heads plugged so no dirt got in. Battery had like 8 or 9 volts left in it. I managed to start the bike by jumping it with my car's battery (with the car off). However, when I take the jump start cables off, the bike's voltage goes down 'til it dies. This is what makes me thing the stator is toast... also, the 3 yellow stator wires are getting HOT. However, I remember seeing the voltage go up to the usual 14V while the bike was on and still connected to the car battery. Is that normal for a fried stator? The car battery's voltage by itself was only about 12.4V. So the stator must have been upping it to 14, no?

I'm just wondering if maybe it's something else, even though those overheating wires give me little hope.

The bike isn't even at my house, it's at my gf's mother's house, so I can't just go out and check anything, so let me know what you guys think and what I should check when I go there later today.

Someone's gonna look at the bike today to see if he buys it, so it'd be great to read your thoughts before that happens.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
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Relocated R/R
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post #2 of 9 (permalink) Old 01-13-2015, 09:24 PM
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Ceal, try taking the mc battery out of the circuit and hook the booster cables directly to the mc cables.

Get someone to hold the voltmeter test leads to the battery and record the dc voltage.

Start the bike and see if voltage rises with just the car battery in the circuit.
If it does, the stator may not be the problem.

I am no electrical guru but it is an easy test to try.

Gordon

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Purchased May 16, 2008
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post #3 of 9 (permalink) Old 01-13-2015, 10:21 PM
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if the yellow wires are getting hot then you could have a bad r/r

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post #4 of 9 (permalink) Old 01-13-2015, 11:16 PM
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You should be able to pop the stator wires of the r/r, leave the bike hooked up to the car so it will continue to run and test the output of the stator. That's what I did on my bike at least. If I'm wrong, someone please feel free to jump in and correct me.
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post #5 of 9 (permalink) Old 01-14-2015, 09:37 AM Thread Starter
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Quote:
Originally Posted by new rider 9984 View Post
if the yellow wires are getting hot then you could have a bad r/r
I thought the hot yellow wires might be an issue with the stator, didn't think it would mean the RR is failing. I do have another one I can put on it... I'll test it out.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #6 of 9 (permalink) Old 01-14-2015, 10:50 PM
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post #7 of 9 (permalink) Old 01-18-2015, 06:15 AM
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You say you have your bike for sale right? Ive got to ask how much and where is it? Ive conciderd building a bobber and being I know that platform fairly well id like to use the 750
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post #8 of 9 (permalink) Old 01-18-2015, 03:26 PM Thread Starter
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Quote:
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You say you have your bike for sale right? Ive got to ask how much and where is it? Ive conciderd building a bobber and being I know that platform fairly well id like to use the 750
Already sold it for $800, in Mexico.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #9 of 9 (permalink) Old 01-21-2015, 11:49 PM
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Heat, in ANY electrical circuit, comes from resistance. Resistance is like to much pressure in a water hose. If it gets to high, the hose will blow. Wires will get hot, and if the resistance goes high enough, they will catch fire and burn into. If the stator was generating power into a dead short, then the wires would get hot. I have found those three yellow wires get hot anyway. Very possible the R/R does not have the capacity to handle the stators output, or is borderline, and if the resistance goes up any more, something will burn. I'm still not sure how the Vulcan is wired. It's possible that a shorted battery could cause high resistance, but it shouldn't. That is such a common problem the charging system should be protected against it. If there were no output from the stator there would be no reason for the yellow wires to get hot. Also, you cannot check the stator output without a good battery that is fully charged. My battery was also dead. I disconnected it, and connected a jump start booster pack to the bike cables. It started and ran fine. But I got no voltage increase at all even revving it up to 3000 rpm.

I have found a LOT of electrical systems where serious $$$$ damage could be done by high resistance or reverse polarity. Nothing was done to protect these expensive parts, though it would have been easy to do so. Hooking up jumper cables backwards can destroy the main ECM in a newer car. Manufacturers love to sell expensive parts.

I am a motorcyclist, NOT a biker.


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