Fused stator diaster - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 29 (permalink) Old 02-23-2007, 07:24 PM Thread Starter
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Fused stator diaster

I was on the phone today with a customer. He is a electrical rebuilder and he also works on bikes as a hobby and side venture when he has time. Guess what came in last week. A VN750 with a fused stator. Well, the stator was destroyed.

Turned out the owner of the bike didn't even know that the stator had been fused as he purchased the bike on eBay last year. According to my guy, one of the fuses popped and the stator was pushing more wattage through the other two legs of the stator and it overheated and grounded one of the legs. He could not tell what caused the fuse to pop. It was not the regulator as it tested good on all tests.

So, I've got confirmation that fusing the stator is not a good idea and in this case caused the stator to fail. I told my customer to give the VN750 owner my email address so I can tell him about the wonderful world of VN750.com...

Wonder how long he will take to fix the bike as speed is not one of his good traits...


Evan Breyn ~ The Bulldog
http://www.bulldogsbike.com
2006 Harley Davidson Ultra Classic FLHTCUI ~ The Big Black Bitch ~ 26,000 miles.
2002 Kawasaki Nomad 1500 ~ The Red Dog ~ Traded in at 22,000 miles of smiles (purchased new 10/05 / Traded in 6/12).
1990 Kawasaki Vulcan 750 ~ Black Betty ~ 34,999.7 miles
VROC ~v~ 485
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post #2 of 29 (permalink) Old 02-23-2007, 08:14 PM
 
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thanks Evan for this info. last year i fused my stator because it was "the flavour of the month" thing to do for the stator. this post has convinced me that i have a bike project this sunday, and that is removing the damn things. the thought never occured to me that a fuse could blow but everything keep humming along until everything fried. thanks again for the "heads up"

ride m safe, J
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post #3 of 29 (permalink) Old 02-23-2007, 10:25 PM
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I found some good quality wire rated at 105 deg C and used that, some solder and shrink tubing to replace the bullet connectors. I'm not totally up on 3 phase generators but it seems nothing good can come from running one with an open leg-which is what you get when the fuse pops. If the current can't flow, do the coils just heat up?

'04 750A- and loving it!
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post #4 of 29 (permalink) Old 02-23-2007, 10:50 PM
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IIRC it will cause the remaining current to pass through the remaining coils...since this is past the wires output limit, the wires turn to resistors, and start buring current as added heat... this further speeds the process b/c as copper heats, it gains more resistance getting even hotter... process is known as thermal runaway

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
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post #5 of 29 (permalink) Old 02-23-2007, 10:53 PM
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I'm glad I didn't fuse my stator wires. Of course, either way it seems the system will manage to toast itself eventually no matter what we do.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
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post #6 of 29 (permalink) Old 02-23-2007, 11:07 PM
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sadly that is the nature of this style of charging system....

'04 Vn750
Currently Installed
nat'l cycle deflector shield
westco 12v30 MF, 30A/h w/ 350 CCA's w/ custom box
TOC stator cover w/ Frankenstator mod!
R/R relo

Soon to have (own or on order)
TOC ACCT's
Mez's 110-FRT 170/80-Rear
Custom rear fender and tail light
Givi hard bags w/ custom rear turn signals


Band Engineer/Webmaster for Josey Contreras Tejano Band
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post #7 of 29 (permalink) Old 02-24-2007, 01:55 AM Thread Starter
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Quote:
Originally Posted by Hizzo3 View Post
IIRC it will cause the remaining current to pass through the remaining coils...since this is past the wires output limit, the wires turn to resistors, and start buring current as added heat... this further speeds the process b/c as copper heats, it gains more resistance getting even hotter... process is known as thermal runaway
Bingo!!!


Evan Breyn ~ The Bulldog
http://www.bulldogsbike.com
2006 Harley Davidson Ultra Classic FLHTCUI ~ The Big Black Bitch ~ 26,000 miles.
2002 Kawasaki Nomad 1500 ~ The Red Dog ~ Traded in at 22,000 miles of smiles (purchased new 10/05 / Traded in 6/12).
1990 Kawasaki Vulcan 750 ~ Black Betty ~ 34,999.7 miles
VROC ~v~ 485
McHenry County Road Pirates
Chicagoland, IL
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post #8 of 29 (permalink) Old 02-24-2007, 03:12 AM
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Quote:
Originally Posted by Hizzo3 View Post
process is known as thermal runaway
Well, that sounds better than just telling someone "My stator burned up"


AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC


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post #9 of 29 (permalink) Old 02-24-2007, 08:44 AM
 
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no matter what you call it, you're still screwed cause you gotta pop the engine to fix it. but at least when someone ask you what happened, you can say,"thermal runaway" and ppl will be real impressed and think your smart or something . LOL
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post #10 of 29 (permalink) Old 02-24-2007, 10:09 AM
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I fused my new stator but I used 20 Amp fuses. If one of these go, there's a major problem anyway.

IMHO, the best tool is a voltmeter connected directly to the battery terminals.

This tells you everything.

Jon

93VN750, under re-construction
vn750.com Member # 828

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