Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator? - Honda Motorcycles - FireBlades.org
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post #1 of 48 Old 02-20-2009, 5:21 PM Thread Starter
 
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Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

Hey guys, so I have this issue on my bike of stators burning out. It is a 2001 929RR. Stock electronics other than a PCIII and integrated tail light. The bike has about 21K miles.

Back in July, I had the stator (OEM) burn up on me, so I replaced it with another. That one worked until about September, at which point I warrantied it, and it gave me no troubles until 3 weeks ago, so I get about 4 months on the stator. Then, lo and behold, the next one burned up again. I have a stock R/R on there, but I have tested it and not seen anything that fails the basic tests.

I was wondering if it made sense to put inline fuses between stator and R/R to prevent too much current from flowing and burning the thing out... and if so what size of fuse should I use? 50A? I would assume the current on a stator is pretty high...

I have a new R/R coming from Electrosport Industries either way, but I really don't see how that could be causing the problem over a period of 4 months.
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post #2 of 48 Old 02-20-2009, 8:17 PM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

the RR is made to dissipate any extra voltage it takes in from the stator via grounding and heat. The stator can pump out approx 80v's and the RR brings it down to the 14v that the components need.

if anything i'd try to make a contraption of sorts that allows you to cool the RR down, thus most likely extending it's life. maybe a little computer fan zip tied to the fins of the RR or a vent to the RR.
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post #3 of 48 Old 02-20-2009, 8:19 PM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by vostok4 View Post
Hey guys, so I have this issue on my bike of stators burning out. It is a 2001 929RR. Stock electronics other than a PCIII and integrated tail light. The bike has about 21K miles.

Back in July, I had the stator (OEM) burn up on me, so I replaced it with another. That one worked until about September, at which point I warrantied it, and it gave me no troubles until 3 weeks ago, so I get about 4 months on the stator. Then, lo and behold, the next one burned up again. I have a stock R/R on there, but I have tested it and not seen anything that fails the basic tests.

I was wondering if it made sense to put inline fuses between stator and R/R to prevent too much current from flowing and burning the thing out... and if so what size of fuse should I use? 50A? I would assume the current on a stator is pretty high...

I have a new R/R coming from Electrosport Industries either way, but I really don't see how that could be causing the problem over a period of 4 months.

also, heat is the main enemy of stators ( your mc oil is doing the cooling ), so you may want to look into if your bike is running a little on the warm side. or if the oil isn't doing a good job of cooling. Maybe time for synth oil?
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post #4 of 48 Old 02-20-2009, 8:21 PM Thread Starter
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

People have mentioned that (hey a fellow Canuck! I lived in Guelph not too long ago ) regarding the oil, but my 5W40 Rotella T full synth should do the job, correct?

What if my oil levels are low, could that cause the top of the stator to be exposed?
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post #5 of 48 Old 02-20-2009, 8:24 PM
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

The stator has oil but it is not to the extent that you are thinking. Aftermarket R&R's have better cooling capability; usually by having a larger heat sink.
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post #6 of 48 Old 02-21-2009, 2:53 AM
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

The stator isn't cooled by the oil.
The oil is just in there to lubricate the starter clutch.

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post #7 of 48 Old 02-21-2009, 5:03 AM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by MACI4LIFE View Post
maybe a little computer fan zip tied to the fins of the RR or a vent to the RR.
I saw this done on a VFR400. They had a habit of eating RR too. Mounted a computer fan onto the heat sink after moving the RR to an area with better airflow round it.
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post #8 of 48 Old 02-21-2009, 3:58 PM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by vostok4 View Post
People have mentioned that (hey a fellow Canuck! I lived in Guelph not too long ago ) regarding the oil, but my 5W40 Rotella T full synth should do the job, correct?

What if my oil levels are low, could that cause the top of the stator to be exposed?
and the same bike
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post #9 of 48 Old 02-21-2009, 4:00 PM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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The stator isn't cooled by the oil.
The oil is just in there to lubricate the starter clutch.
it cools more than you think. There's no other reason why oil should even be in that location. Oil is the medium that allows the stator to dissapate the heat.
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post #10 of 48 Old 02-21-2009, 4:01 PM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by lanbrown View Post
The stator has oil but it is not to the extent that you are thinking. Aftermarket R&R's have better cooling capability; usually by having a larger heat sink.
my aftermarket RR had a little larger heatsink but there still was no air circulation so i figure any air movement will help greatly.
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post #11 of 48 Old 02-22-2009, 2:59 AM
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by MACI4LIFE View Post
it cools more than you think. There's no other reason why oil should even be in that location. Oil is the medium that allows the stator to dissapate the heat.
As I said earlier, the oil is to lubricate the starter clutch which is inside the rotor. The oil does not circulate through the stator at all. It comes in from the main bearing and flows back into the sump.

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post #12 of 48 Old 02-22-2009, 7:18 PM Thread Starter
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

Well so on Friday I got my stator in the mail, I installed it, replaced the gasket etc, made sure the oil level was topped off and its running like a dream. Voltages across the battery terminals are no higher than 14.45v when charging, and no lower than about 13.2v when running it seems.

I guess here is the golden question, will a malfunctioning R/R cause the windings on a stator to burn through (on 3 different stators!)?

bladeracer you are the first to mention that oil does nothing to cool the stator :S the guys at the local shop mentioned the same thing (oil weight, type of oil etc). i guess i cannot be too quick to jump to conclusions...

well on Monday or Tuesday when the new R/R comes (Electrosport Industries told me the part was updated, beefier design that is much more reliable), I will install it regardless and see how everything goes. For now it seems to be running OK, but I won't go on any long rides until I have the new R/R in there for peace of mind.
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post #13 of 48 Old 03-11-2009, 1:01 AM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

im also having the same problem, so im used to change the stator every 6 months or so, i even have 3 in stock lol.
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post #14 of 48 Old 03-11-2009, 1:25 AM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

when installing the replacement stators, are you sure they are not grounding to the housing?
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post #15 of 48 Old 03-11-2009, 1:58 AM
 
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Re: Putting Inline Fuses Between Stator and R/R To Prevent Burning Stator?

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Originally Posted by sonik_fury View Post
when installing the replacement stators, are you sure they are not grounding to the housing?
well i guess the stator is ground to the casing since the bolts that holds it in place screw directly into the stator cover.
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