Anyone recognize this part? - BMW F800 Riders Forum & Registry



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  1. #1
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    I found this on the garage floor after letting my 2011 F800GS off the center stand. It looks like a automotive part too me. It’s a copper, thin jamb nut like you would find on an electrical lug. It’s 15mm inside diameter and I can’t imagine a motorcycle using an electrical lug that big but……… Sitting at a red light when suddenly motor starts to sputter while LCD dash fades out then engine and bike dies. Completely dead, no power at all. After I push it to a safe place I think over what’s going on and all power comes back on, engine cranks good and runs fine. Rode it home about 20 minutes with no issues. Found both battery connections a bit loose so tightened them up. A bunch of codes came up but most notably is A2E8- undervoltage.
    Could this be a strange coincidence finding the copper nut and having electrical issues on the same day?
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  3. #2
    Richard230's Avatar
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    That big nut kind of reminds me of the nut that fastens the BMW power port to the frame of a BMW airhead.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

  4. #3
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    Quote Originally Posted by Richard230 View Post
    That big nut kind of reminds me of the nut that fastens the BMW power port to the frame of a BMW airhead.
    The auxiliary power port by the key?
    Edit- I see you’re talking about a different model bike.

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  6. #4
    BoxerBits's Avatar
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    Rick W!

    As earlier post, they used similar Aux power sockets on a number of different bikes. It was certainly the same on the K series Bricks as on the Boxer Air Heads through to the Oil Heads that I've ever owned. Not had any reason to look at in any detail the one fitted to my F800 but it looks pretty similar.

    See the nut on part number ELA91630 on the following :-

    https://www.motorworks.co.uk/vlive/S...=15&M=90&Ct=ZA



    Sent from my moto g(8) power lite using Tapatalk

  7. #5
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    Thanks! And yes that does look like the same type of nut though mine is copper. My bike has the original power port and no others added but who knows what previous owners had done over the years. I don’t see one of those nuts coming lose and falling off the vehicle as the attached wires would retain it….. I would think a most likely scenario would be someone working on the bike dropped it and couldn’t find where it went to retrieve it. None of that would explain a link to my current power issues though….

  8. #6
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    The nut goes on the back side of this lock cylinder!… Did some testing and the electrical system seems to be working fine. Thanks for the input all!
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