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.

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.

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'

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?

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.

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.