BMW K bikes (Bricks)

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Jhepburn

Jhepburn
Silver member
Silver member
So, here's the thing. We have two K100RS - one 1984, one 1985. Mine is Hermann. Hers is Helga. 

Hermann had the intermittent speedo problem first. I opened the unit, and found that a previous owner had butchered it - the circuit board with three prongs on it, at the top, had been cut through and shabbily soldered back together during a filthy attempt to mount the supporting piece of white plastic to the speedo unit. There were other problems, including connections becoming unstuck. 

Eventually, I gave up when the speedo stopped working entirely, and got a second-hand unit. Eventually, that one developed the intermittent speedo problem as well. This time, the insides were clean and virginal. I very, very carefully cut through the supporting arm and remounted it to the speedo unit, while gently twisting the pins, thereby completely curing the intermittency and giving me an ultra-reliable speedo again.

Then, there is Helga. Helga, which is in excellent condition, had the intermittent speedo problem for a while. My partner didn't care. She is amazingly good at judging speed, and anyway, when we ride in a group, she always gets me to lead, so it didn't really matter as much. But, having fixed Hermann properly, I changed the mounting arm and now it's reliable. 

But Helga's odometer stopped turning This is much more of a nuisance, for reasons including mileage and judging fuel. My first attempt involving examining the gears - they all appear to be clean, apparently unworn and completely intact. I turned them with a screwdriver - the numbers moved. I put it back on the bike, and ran it carefully in top gear on the centre stand (yes, I took an awful lot of precautions) - the numbers moved. The odometer worked!

She took it for a ride. The odometer did not work. I tried again, this time examining all the connections and gently twisting the pins so the contact was better. The odometer worked precisely once. The second test - no dice.

At this point, my question is: Who in Brisbane is the best person to fix this? I don't like electrical things. They and I don't get along.

    

RicK G

RicK G
VIP
VIP
@Jhepburn wrote:So, here's the thing. We have two K100RS - one 1984, one 1985. Mine is Hermann. Hers is Helga. 

Hermann had the intermittent speedo problem first. I opened the unit, and found that a previous owner had butchered it - the circuit board with three prongs on it, at the top, had been cut through and shabbily soldered back together during a filthy attempt to mount the supporting piece of white plastic to the speedo unit. There were other problems, including connections becoming unstuck. 

Eventually, I gave up when the speedo stopped working entirely, and got a second-hand unit. Eventually, that one developed the intermittent speedo problem as well. This time, the insides were clean and virginal. I very, very carefully cut through the supporting arm and remounted it to the speedo unit, while gently twisting the pins, thereby completely curing the intermittency and giving me an ultra-reliable speedo again.

Then, there is Helga. Helga, which is in excellent condition, had the intermittent speedo problem for a while. My partner didn't care. She is amazingly good at judging speed, and anyway, when we ride in a group, she always gets me to lead, so it didn't really matter as much. But, having fixed Hermann properly, I changed the mounting arm and now it's reliable. 

But Helga's odometer stopped turning This is much more of a nuisance, for reasons including mileage and judging fuel. My first attempt involving examining the gears - they all appear to be clean, apparently unworn and completely intact. I turned them with a screwdriver - the numbers moved. I put it back on the bike, and ran it carefully in top gear on the centre stand (yes, I took an awful lot of precautions) - the numbers moved. The odometer worked!

She took it for a ride. The odometer did not work. I tried again, this time examining all the connections and gently twisting the pins so the contact was better. The odometer worked precisely once. The second test - no dice.

At this point, my question is: Who in Brisbane is the best person to fix this? I don't like electrical things. They and I don't get along.
First stop for anything is Lionel Otto at Otto instruments. Now he is a nice guy but doesn't really like working on K bike speedos but if you are lucky he may relent and have a look for you.
Other than Lionel I would just be having a look for instrument fitters.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

charlie99

charlie99
VIP
VIP
of coarse you could just go into the instruments and bridge the electrical connections from input connector to the driver board and then to instrument motor .

I had some relative success in doing some mods on mine ,,,,the speedo has not missed a beat in over 20,000 ks so far ...and im lucky that the odo has not got the missing teeth issue.

if lost for ideas ...beg "otto'


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OI have now officially decided that my odometer problem is "gremlins" Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
Works when on stand in gear....not works when on the ground.

The wire from the sensor at the diff bends with the swinging arm.....could it be broken inside the insulation?


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

Jhepburn

Jhepburn
Silver member
Silver member
92KK K100LT 193214 wrote:Works when on stand in gear....not works when on the ground.

The wire from the sensor at the diff bends with the swinging arm.....could it be broken inside the insulation?
Clever, but not quite. The second time, it was still on the centre stand. I switched off, restarted, tried again - no go. Also, the speedo continued to operate. Unless there's two wires carrying the same signal, it has to be something in the instrument panel, *unless* the odo needs a stronger signal.

    

RicK G

RicK G
VIP
VIP
The signal does split after it is amplified, one side goes to the meter and the other to a stepper motor to driive the odo so it is quite likely it's inside the cluster.
Big problem with these things is age, my K1100 is giving trouble and occasionally wavers a bit and I have considered getting a digital meter
I bought a working unit from a K1300GT a while ago but the workings are very different I dont think I could successfully adapt it but I reckon I can sell it for more than I bought it for. It gets all its signals from the main computer and is all digital.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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