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1990- BMW Cafe

This is a discussion on 1990- BMW Cafe within the Technical forums, part of the Caferacer.net Forums category; Hey guys, I'm not a motorcycle or technical guy but I have a client who hs a 1990 BMW and I need to put a ...

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  1. #1
    Junior Member discostu004's Avatar
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    1990- BMW Cafe

    Hey guys, I'm not a motorcycle or technical guy but I have a client who hs a 1990 BMW and I need to put a trickle charger on it while it is winter but for the life of me I can't access the battery area and the owner (not living here) doesn't remember how. I can't find a seat release to pop up or anything. any help would be appreciated

  2. #2
    Senior Member TrialsRider's Avatar
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    If it's a K model you just remove the side cover and clip the alligator clip on the terminal, the ground can go to anywhere that is a ground. If it is an R somebody else will need to chime in.

    ... if the bike is using a cheap lawn tractor battery instead of the original one, the positive will be on the right hand side, the original + was on the left.
    Seat release is keyed, look for the lock on the left side of the bike and push, if it don't push it's locked.



    oh wait, you say it has been turned into some kind of cafe racer thing? lord only knows where they put it,
    it might even be a lithium battery that can bust into flames if you leave it on the charger.
    just take it for a ride every once in a while to charge it up, that's what I would do
    Last edited by TrialsRider; 10-24-2019 at 02:11 PM.

  3. #3
    Junior Member discostu004's Avatar
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    Thank you. Battery is already too weak to turn on. Also how would I know if it is a lithium battery?

    Quote Originally Posted by TrialsRider View Post
    If it's a K model you just remove the side cover and clip the alligator clip on the terminal, the ground can go to anywhere that is a ground. If it is an R somebody else will need to chime in.

    ... if the bike is using a cheap lawn tractor battery instead of the original one, the positive will be on the right hand side, the original + was on the left.
    Seat release is keyed, look for the lock on the left side of the bike and push, if it don't push it's locked.



    oh wait, you say it has been turned into some kind of cafe racer thing? lord only knows where they put it,
    it might even be a lithium battery that can bust into flames if you leave it on the charger.
    <img src="https://www.caferacer.net/forum/images/smilies/wink.png" border="0" alt="" title="Wink" class="inlineimg" /> just take it for a ride every once in a while to charge it up, that's what I would do

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  5. #4
    Senior Member TrialsRider's Avatar
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    can you post pictures? it might be obvious to lots of guys here, nobody in here except a bunch of freakin motorcycle gear heads

    does it look like a car engine with all the cylinders down one side

    or does it have one on each side placed kind cockeyed
    Last edited by TrialsRider; 10-24-2019 at 04:44 PM.

  6. #5
    Junior Member discostu004's Avatar
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    good idea, thanks. i'll be there tomorrow and will snap a few pix. owner swore there was a button towards the back that released the seat, but i looked and unless i'm somehow just glossing over it, i just didn't see it
    TrialsRider likes this.

  7. #6
    Senior Member Geeto67's Avatar
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    if the bike is an airhead (twin cylinder, horizontally opposed engine), there is a seat release button on the left side right by the key lock for the seat (below the seat but above the seat cover, next to the grab handle). If the seat is locked, the button won't work. the ignition key should unlock it.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
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  8. #7
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by Geeto67 View Post
    if the bike is an airhead (twin cylinder, horizontally opposed engine), there is a seat release button on the left side right by the key lock for the seat (below the seat but above the seat cover, next to the grab handle). If the seat is locked, the button won't work. the ignition key should unlock it.
    Is that the easiest way to access the battery Geeto?

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    Junior Member discostu004's Avatar
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    here are the pix. does this help anyone determine where it might be?

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    Senior Member steveo's Avatar
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    I might well be wrong, the first pic seems to show that you already have an optimate charger lead fitted.
    The bike is a bit older than 1990, early/mid 80's would me my guess.
    Attached Images Attached Images  
    TrialsRider likes this.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  11. #10
    Junior Member discostu004's Avatar
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    Quote Originally Posted by steveo View Post
    I might well be wrong, the first pic seems to show that you already have an optimate charger lead fitted.
    The bike is a bit older than 1990, early/mid 80's would me my guess.
    thanks, what do i do with that? also the delivery paperwork said 1990 but owner said 1980 and i don't know anything about these. any specific help as to what to get to keep it charged AND how to connect would be much appreciated

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