BMW K bikes (Bricks)


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1Back to top Go down    Hunting Down an Electrical Gremlin on Sat Oct 15, 2016 11:54 pm

TurboBrick

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Here's the issue I have.. When I turn the key to the first position I get nothing. Second turn illuminates the cluster and my abs light comes on as it should. I put the bike in neutral, hold the clutch, push the button, anddddd crickets. Nothing. Here's what I believe the problem is. The neutral light never comes on in the cluster. I know that light has to come on to complete the circuit and tell the computer to let the bike start. But also things like the oil light, choke light, fuel level sensor doesn't come on. So here's some more information to help me diagnose.

  • Clutch switch, kill switches, anything that can stop a k bike from starting has been checked and bypassed to attempt starting
  • Bike has been dropped. Actually backed into while in a garage and fell over. (why its a project bike)
  • Bike turns over fine when you jump the solenoid
  • new battery
  • gear selection switch was taken apart and "rebuilt" by me. (still consider it a culprit though, not my best work)

Here's what I think, and my bike mechanic disagrees on. I think the problem is within the cluster. I believe the fall broke an essential ground in the cluster causing half of it to not work. My mechanic is at his whits end and doesn't know what it could be. So what are my options? Can i tear the cluster open and search for the break? Can I get a super cheap cluster that will work properly for my bike and see if that fixes it? Or am I completely off and shouldn't waste my time with that fix?
My bike by the way is 1991 Bmw K100rs with a RB "Luftmeister" competion turbo kit on it. The bike has 12,xxx miles.

YOU GUYS ARE THE GENIUSES HERE! HELP ME GET MY DREAM BIKE GOING!
Thanks in advance.



Last edited by TurboBrick on Sun Oct 16, 2016 12:04 am; edited 1 time in total (Reason for editing : grammar/spelling)

    

2Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 12:27 am

duck

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Have you tried pulling in the clutch and trying to start it?

That will start a K bike that has the cluster removed.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 12:32 am

TurboBrick

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Yes I have tried that. I didn't know a k bike could start without the cluster. Are you sure a 91' isn't different. I know they changed quite a bit that year. From the looks of the schematic it won't start without it.


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1991 K100rs w/ Luftmeister Competition Turbo Kit
    

4Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 12:46 am

RicK G

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In that aspect they are the same, Pull the clutch lever in and that overrides the no start unless in neutral feature.
The cluster is quite easy to get apart to check the bulbs are working and replace them also check for corrosion on the connector pins inside and the pins at the main connector.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

5Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 1:13 am

duck

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Either the N electronics in the cluster or the clutch switch feed 12V+ to the start button. When you press that it sends 12V to the starter relay via the black/yellow wire that goes to the starter relay to activate it.

If that isn't happening then I'd suspect the ignition switch might be the culprit. Or maybe a ground come loose. Or that funky starter grounding thing.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 6:04 am

Inge K.

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Check fuse #1 it supply the clutch switch and all that doesn't function in your
cluster, and the your brake light shouldn't function either.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

7Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 11:19 am

TurboBrick

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It's not the fuse. I've bypassed both the clutch switch and the starter button. I will check the cluster though for a bad light or two. Also why isn't the first turn of the key doing anything? What specific grounds can I be checking? The only ones I really know of are the 3 under the tank.


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1991 K100rs w/ Luftmeister Competition Turbo Kit
    

8Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 11:34 am

Inge K.

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@TurboBrick wrote: It's not the fuse. I've bypassed both the clutch switch and the starter button.

Did you check if it was 12V+ present in the clutch switch connector?

Does Your brake light function?


@TurboBrick wrote: Also why isn't the first turn of the key doing anything?

It is park position, you should then have power to the small pilot lamp above the headlight and and to the taillight.



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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

9Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 2:24 pm

TurboBrick

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@Inge K. wrote:
@TurboBrick wrote: It's not the fuse. I've bypassed both the clutch switch and the starter button.

Did you check if it was 12V+ present in the clutch switch connector?

Does Your brake light function?


@TurboBrick wrote: Also why isn't the first turn of the key doing anything?

It is park position, you should then have power to the small pilot lamp above the headlight and and to the taillight.

I will check for 12v at the clutch switch. The brake lights and headlights function fine

    

10Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 2:48 pm

Point-Seven-five

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When you push the start button does the headlight go off? If not, I would suspect the ignition switch may be dirty. I had a similar problem with my K75 a couple years ago and it turned out to be the ignition switch. Seems the design doesn't allow for a lot of pressure on the contacts to overcome any dirt that may be in there.

Even if it isn't the problem, in bikes as old as our K's it isn't a bad idea to sevice that switch.

http://www.eilenberger.net/K75S/IgnitionSwitch/


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

11Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 9:54 pm

TurboBrick

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No the headlight doesn't go off. I will try that.


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1991 K100rs w/ Luftmeister Competition Turbo Kit
    

12Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 10:04 pm

Inge K.

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The headlight doesn't go out as a result of that you got no power out of the starter relay, that is what breaks the LSR coil ground connection.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

13Back to top Go down    Re: Hunting Down an Electrical Gremlin on Sun Oct 16, 2016 10:52 pm

TurboBrick

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Ok. Sounds right to me. I'll see if I can fix that tomorrow. 👌🏽


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1991 K100rs w/ Luftmeister Competition Turbo Kit
    

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