The "Why" of Stator Failure? - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
Rectifier, Diagrams, etc

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post #11 of 30 (permalink) Old 06-15-2019, 12:32 AM
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It’s my first bike, so I don’t have anything to compare it to but I sure know I’ve been having a great time with it. Im not done with her yet
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post #12 of 30 (permalink) Old 06-15-2019, 02:03 PM Thread Starter
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Quote:
Originally Posted by Paulywog View Post
Check Roadster Cycle,California??
Got my MOSFET from him, but he doesn't do stators. Has series type r/r kits also.

He's updated his page a bit, I noticed he says the MOSFET is OEM for some Yamaha and Suzuki bikes. Says he'll give tech support even if you bought your r/r somewhere else, and tells you how to spot the fake MOSFETs being sold cheap.

https://roadstercycle.com/
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post #13 of 30 (permalink) Old 06-17-2019, 04:05 PM
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Thanks Spockster,that's the place I was thinking of. Guy will work with you for sure.
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post #14 of 30 (permalink) Old 11-04-2019, 10:45 AM
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Over the winter, I'm dropping my engine for a coolant leak.
While I'm at it, I'm considering the tuxedo mod, since the engine will already be out.
So far at 27k miles, the stator is still good.

If the suspected failure mode is thermal expansion wearing away the insulation, is it possible to recoat it before it fails?
I'm thinking of anything from spraying it with lacquer, to brushing on clear fingernail polish, to dropping the entire stator in a bucket of lacquer.
Since it's in the inside corners of the windings, it's probably going to take soaking it.

Next question is if it would be worth it.
It might take $$$ worth of lacquer just to have enough to submerse it.


'89 VN750 Bought stock 4/12/18 @ 17805.9 miles $800. Wrecked once. 27454.5+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB. 110/90 Front Tire. Pick-up coil mod. Shindengen MOSFET FH020AA r/r. USB Outlet + Voltmeter. Repainted Metallic Blue w/ new tank bages. Ear Shave (wo/ coasters) 40/140 NO shims 45MPG. MCCT conversion.

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Custom LED turn signals. Windshield. Highway Pegs. (Possible) ignition adv. Tuxedo Mod. Ignition coil mod.
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post #15 of 30 (permalink) Old 11-04-2019, 10:53 AM
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My suspicion is that the wear thru occurs inside the already encapsulated windings. Its going to be really hard to get that stuff off without damage to the wires, i would leave it alone if its working OK

'99 Vulcan "Victoria"
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post #16 of 30 (permalink) Old 11-04-2019, 12:13 PM
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You'd never be able to re-coat it in such a way that you'd be prolonging it's life. The insulation on the wires is super thin and applied to the wire before the winding occurs. The post-wound stator is epoxied after winding to prevent vibration, and that epoxy is probably very much intact when the wire insulation breaks down. Any additional epoxy you add would just trap heat in the stator and wouldn't do anything to prevent a short between the windings.

1992 US-nonCA * tuxedo mod * r/r relocated

Vulcan slang for newcomers
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Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #17 of 30 (permalink) Old 11-04-2019, 12:50 PM
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Ricks is the best stator out there. A good stator has to do more than produce electricity. The Caltric stators donít push until close to 1050rpm, the Ricks start pushing at 750 and are above 13.8 by 850, and peak at 14.4 around 1000. The regulator will start backing it up around 3600. Thatís where you start stressing the stator.


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post #18 of 30 (permalink) Old 11-04-2019, 01:33 PM
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My bike will barely run at 750 rpm
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post #19 of 30 (permalink) Old 11-04-2019, 07:43 PM
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Just a lil bit of carb tuning and she’ll hit a lick.

800rpm



Caltric voltage notice how high the rpm is to get above 13


Ricks voltage always 13 + (14.8 at 1100)



1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.

Last edited by One1; 11-04-2019 at 07:46 PM.
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post #20 of 30 (permalink) Old 11-17-2019, 02:25 AM
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I have replaced one stator at about 85,000 miles. I just recently bought a 1997 model with 27,000 miles on it. Right now it is charging fine. But I removed the bullet connectors in the three yellow wires and soldered them anyway, even though they showed no signs of overheating. I doubt I would replace another stator. Some people take shortcuts, I pulled the engine completely out of the bike, which required disassembling a good part of the rest of the bike. It was a 6 month project on and off. It's sad that this simple design flaw (having to remove the engine) has caused so many people so much grief. That and a few other things about the VN750 cause me doubts about the competence of Kawasaki's engineers. The bike would have been just as good without these issues. The VN750 turned out to be a great bike despite it's flaws. But it seems like it was designed by several different people who never communicated with each other.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
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