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Old 09-16-2021, 06:51 AM   #1
Entoptic
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Oil wicking from stator

Man my MV Agusta - amazing bike but such a pain in the butt sometimes.

I looked at the connector between stator and r/r and it's cooked. After inspecting it I noticed that oil had wicked up from the stator, travelled up through the wire covering and to the connector cooking it.

Apparently this is a common issue on some bikes. I was curious if anyone has dealt with this and what their solution was. The internet has a ton of info however there doesn't seem to be a common fix. Something tells me I need to solder the wires and shrink wrap them afterwards to stop the cooking issue.

Thoughts?
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Old 09-16-2021, 07:48 AM   #2
scootergmc
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I had an Aprilia Futura that melted that connector (common issue with that generation of Aprilias) and that's exactly what I did, solder the wires to each other, liquid electrical tape, then individual electrical tape, then taped together. Shrink wrap would be a good idea if it's high quality/temp shrink wrap.
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Old 09-16-2021, 08:49 AM   #3
Busy Little Shop
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Everyone should perform a one time inspection of their QD and take
appropriate action like replace the QD or just solder the wires together...

As the RC45 Club's tech advisor I received this urgent photo and a
request as to the reason why fire almost claimed this members RC45 ...



Story goes that Bob and Pam Solloway of Coventry UK were on the way to
Misano WSB when Pam's RC45 caught fire while stopped at a light...
fortunately the flames were beat back by bottle water from a passing
motorist... they were lucky the incident did not happen out in the
middle of nowhere for it would have spread rapidly to the fuel lines
and then the tank... nothing is worst as watching bike flambeau...

I was positive that the QD had suffered enough resistance to heat and
melt the insulation on the wires... the wires got enough to start a
fire which all most consumed her prize...

I pulled the seat cowl off my RC45 to send her a pic of the quick
disconnect in question and Mercy was I ever in for a shock... my quick
disconnect was bad and about to turn my bike into a crispy critter.


Apparently corrosion builds up between the quick disconnect pins
generating resistance enough to melt the plastic and insulation...

Cleaning the pins with a wire brush and coating them in dielectric
grease can prevent this danger from becoming a problem...

My quick disconnect was toast... I decided to cut and solder the wires
directly and seal with heat shrink tubing...

I've solder the wires directly to eliminate the possibility of fire...
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Old 09-17-2021, 03:18 PM   #4
stever
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I would never forgive you if your Mexico vacay RC had gone up in flames. When I was at Fairfield Cycle in the 80’s we started getting quite a few gold wings with various stages of fried reg/rectifiers or connectors. The techs started direct wiring them. I’ve seen on lots of blogs where folks would blame the
“Honda rectifiers”. Gues what, they don’t make the rectifiers. Same units tend to be on lots of different brands. Key issue is going to be corrosion in the connector but easily prevented with the dielectric grease when bike is new. As I service my ride I use the dielectric on every connector I come across. The other part of this equation is the use of too small wire from the generator. When I bought a Shindengen 847 series reg from Roadster Cycle he supplies it with larger stator wires which are high quality marine copper stranded. The 847 can handle up to 50amp current so very unlikely to fail. Glad you didn’t fry your RC Larry. You are leaving it to me in your will right?
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Old 09-18-2021, 09:15 PM   #5
gixxerjeff
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I had triumph Daytona that did this exact same thing. I'm lucky it only left me stranded instead of completely igniting itself.
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Old 09-19-2021, 07:47 PM   #6
Busy Little Shop
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Steve
I noticed Yamaha's R1 Rec/Reg are more robust than Honda's dedicated
and costly RC45 Rec/Reg but I had to Mill off some of the fins and
then design and machine a custom aluminum hanger... all in all the Mod
netted a constant 13.7 to 14.2 volts no matter the RPMS... I've
completed this mod for other RC45 owners suffering from charging and
running problems...


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Have a wheelie NICE day...
Lean & Mean it in every corner of your life...
If it wasn't for us the fast lane would rust...
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http://www.flickr.com/photos/55532474@N00/?saved=1
http://www.flickr.com/photos/10503451@N07/

Last edited by Busy Little Shop; 09-20-2021 at 10:59 AM..
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Old 09-20-2021, 10:11 AM   #7
stever
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I think those later R1s are running the Shindengen mosfet regulators, top quality stuff. I elected to go with the SH847 series reg which is 3/4 to 1 inch larger in length & width and 1/4 inch taller but I was able to fit it under Miss Piggy’s generous tail.
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Old 09-23-2021, 09:05 PM   #8
islemann
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Shindengen SH847AA is _the_ solution

Quote:
Originally Posted by stever View Post
I think those later R1s are running the Shindengen mosfet regulators, top quality stuff. I elected to go with the SH847 series reg which is 3/4 to 1 inch larger in length & width and 1/4 inch taller but I was able to fit it under Miss Piggy’s generous tail.
It's not only MOSFET - it also goes "open" vs. "shunt" or "short to ground" the stator. That makes for a much cooler running stator, and that equates to a stator that doesn't melt itself into oblivion.

FYI - if you're unplugging the headlamps for track days, or you've upgraded your headlamps to LED instead of the stock halogen lamps - you will want very much to upgrade to the Shindengen SH847AA.

roadstercycle.com is the best and fastest source. Yes, you can find "Shindengen" regulator/rectifiers on EBay or on Amazon. Beware - those are more likely than not to be counterfeits and junk.

As to the oil wicking - that is not likely what caused the quick connector to fry itself. High resistance at the metal to metal connections is what killed it. Over time - corrosion builds up, the resistance in the joint causes heat, the heat weakens the connector, loose connector increases resistance, increased resistance causes more heat - rinse, lather, repeat until moto flambe.

Using dielectric grease on all of the connectors on a moto is one of those things that should be a part of your annual deep service routine.
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Old 10-10-2021, 09:32 AM   #9
Schissels
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Had this issue with my Triumph street triple. The connector was partially melted as was the insulation on the wires. OK, just replace the connector, it should be a universal part. Tried finding one at O'Reillys and Autozone - No luck..
A west Oakland automotive electrical shop did have one, for $20. Ended up cutting out the connector and soldering the wires together.
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