Rebuilt Stator worked for 200 miles.... now what?

Discussion in 'Parallel Universe' started by TheCowboy, Oct 7, 2011.

  1. tofire409

    tofire409 Geared up and ready.

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    I was looking at this thread http://www.advrider.com/forums/showthread.php?t=395505&page=5 when I came across this post:

    "F800GS/F650GS Electical System Capabilities
    Measurements made by Joel Wisman on new F800GS
    Ref: http://www.advrider.com/forums/showpost.php?p=10368118&postcount=60
    Amps Watts * Notes
    Engine off
    Key on 1.8A 25W *1.74 amps if kill switch is in kill position
    Key on, high beam on 5.7A 77W
    Engine running
    Low beam on (baseline) 10.8A 147W * Add other current draws to this value
    High beam on 4.1A 56W
    Heated grips low 2.0A 28W Max draw
    Heated grips high 3.4A 46W Max draw
    Cooling fan 4.7A 64W
    Alternator output (held at constant 13.6 volts)
    1280 rpm (idle) 17.7A 241W *94 watts over baseline load
    3000 rpm 25.9A 352W *205 watts over baseline load
    4500-7500 rpm 27.8A 378W *231 watts over baseline load**
    * Measurements made while holding voltage to 13.6 volts. Watts = Amps x 13.6 volts.
    ** System can deliver 27.8 amps (current-limited) at 14.4 volts, or 400 watts (per BMW spec)
    Current draw after turning engine off with key:
    First 3.5 seconds 830 milliamps Computer shut-down, etc.
    Next 3 seconds 170 milliamps
    Next 54 seconds 88 milliamps
    Thereafter 1.3 milliamps For clock and volatile memory"

    It could explain why some batteries and stators give up.
    #61
  2. TheCowboy

    TheCowboy back in the saddle again

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    OK, after returning from my trip I took my F8 to my BMW dealer. I told them the whole story for troubleshooting purposes. The end result - just as I figured - bad stator, even though I had it rewound in Durango.... The stats: leg one 25v, leg two 4v, leg three 3v.

    I am going to pull the stator again and send it to Rick's Motosport Electrical as mentioned earlier in this thread.

    TheCowboy
    #62
  3. JRWooden

    JRWooden Long timer

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    Cowboy:
    Rick should know this, but ...as others have mentioned:

    1) it appears there might be enough room in there to rewind with wire that is of slightly heavier gauge which would be wonderful.

    2) windings should be done with hi-temp insulated wire... Rick can probably look at your stator and see if that is why it failed again so quickly....
    #63
  4. LukasM

    LukasM Long timer

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    This is what you are going to get back:

    [​IMG]
    #64
  5. Y E T I

    Y E T I No Talent Ass Clown

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    Do you get more volts/amp/watts/whatevers with Rick's re-wind?
    #65
  6. LukasM

    LukasM Long timer

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    I don't think so, they are supposed to rewind it to stock specs, hopefully with higher quality materials.

    That's fine for me, I would prefer to have the same power and longer stator life. Probably won't get around a series regulator, though...
    #66
  7. JRWooden

    JRWooden Long timer

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    Could be worse :lol3
    http://www.youtube.com/watch?NR=1&v=Ow8Unmr9ziI
    #67
  8. TheCowboy

    TheCowboy back in the saddle again

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    Thanks JR, i am going to call Rick tomarrow... I would like OME stator specs but to last at least 100,000 miles..

    TheCowboy
    #68
  9. ebrabaek

    ebrabaek Long timer

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    As mentioned earlier in the thread... You might want to test your jacket to see....or just make sure it`s functioning ok....and more importantly don`t over tax the system overall....... Just to be safe......:thumb:thumb

    Erling
    #69
  10. JRWooden

    JRWooden Long timer

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    yeah ... I wish I knew more about it, but heavier gauge wire would help a lot as it would cut down on heat produced by the stator. Highest temperature insulation available (that's not bulky) should help lifespan.

    Let us know what Rick says!
    #70
  11. flying.moto

    flying.moto Earthbound Misfit, I

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    Very interesting topic, guys. I have done a little research on this and you might find this an interesting read.

    http://www.triumphrat.net/speed-tri...-diagnostics-rectifier-regulator-upgrade.html

    Looks like this exact unit is used on many many other bikes and quads. From late year liter sportbikes to small thumper quads.

    there was another link to someone making these kits, sorry if its a repeat, just want to sum it up:

    http://roadstercycle.com/Shindengen FH012AA Regulator upgrade kit.htm

    Now, simply changing stators, with heavier wire winding or not is not curing the issue imo. This mod looks like a plausible bump in reliability tho, and I think I'd do it before setting off for Deadhorse, and not to have...a dead horse :evil. I'm not yet 100% sure in F800 application but if there is in fact, as i remember from a diagram posted in one of these stator related threads, no interaction between R/R and digital side of things, this should be a simple swap that will decrease engine temps, mechanical load, increase reliability, and maybe fuel mileage(!) and make the stator sweat less. So a stock unit may be well up to snuff? i'm just really surprised about the use of shunt-type r/r (correct me if I'm wrong but i think that has been determined by someone here) on such high-tech expensive bikes, or 21st century at all. My friend today said, that technology came before carbon-pile stuff, and that's, I'm sorry, 1940's at least...

    Anyway, interesting stuff!
    #71
  12. LukasM

    LukasM Long timer

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    The above Shindengen MOSFET R/R is a shunting type as well, just a more efficient one. Itself it will hold up longer than the stock unit (also made by Shindengen I think) but it will do nothing to increase stator life, in fact it may worsen it.

    There are a couple of threads on this topic and possible solutions, read up on serial regulators, e.g. Compufire 55402.
    #72
  13. flying.moto

    flying.moto Earthbound Misfit, I

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    Interesting. I looked up more info on Shindengen website, and it does look that way. Rats. Even though they do have a 3-phase serial version, but it is not strong enough... thanks for the hint, Lukas, i'll keep looking.

    EDIT: I found the other stator thread talking about these! thanks.
    #73
  14. LukasM

    LukasM Long timer

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    No problem. If you google the Compufire you will see it used successfully on quite a few bikes that also have stator problems. Should work great on the BMWs. I just have too many more important projects at the moment and don't put enough miles on the BMW or I would have done it already. Just a couple of wires and plugs to hook up.

    There is one other model and brand that is physically a bit bigger but should still be ok in our application. Don't remember the name right now, but I'd make it easy on myself and use the proven Compufire for less than $200.
    #74