85 K100RS Speed Sensor - K-Bikes.com - Excellence in Motion
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post #1 of 2 (permalink) Old May 26th, 2013, 12:52 pm Thread Starter
droopydawg's Avatar
Join Date: Aug 2006
Location: Lake Forest, Illinois, USA
Posts: 17
85 K100RS Speed Sensor

aka, Speedometer impulse Transmitter.
Is there a way to check this sensor?
I have replaced the broken gears within the speedometer unit and they seem turn everything freely.
I have tested and have good resistance from the wires that run from the sensor all the way to the speedo.
Now I am wondering if it the sensor,... the one that plugs into the rear hub and reads an impulse from the spinning impulse wheel when the rear wheel is turning is at fault.

Any ideas?

I have checked A&S and BikeBandit and can not see this part listed for sale.

-Drew in Chicago

Drew Mobley
GT Bean Counter
Atlanta, Ga

Yamaha '86 SRX600, '87SRX250
'88 Honda NX650
'66 Sears Saber 50
'85 BMW K100RS

Last edited by droopydawg; May 26th, 2013 at 2:54 pm.
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post #2 of 2 (permalink) Old May 26th, 2013, 5:48 pm
Join Date: Mar 2004
Location: , , UK
Posts: 3,750
That may be because it is shown with the Horn??

Don't have your bike, but maybe this will help:


Lots of cash and usually it is not the sensor that gives problems if the wiring connections are good.

If you can file a flat disc of sheet steel about 2 inches diameter with six to eight deep 'V' notches around the outside edge, then fit it on to an arbor and run it in a battery drill, you should get something on the speedo.

If the setup is the same as the K1200, it is often the notched ring inside the rear drive that comes loose and stops rotating. If the sensor checks out with the drill, and doesn't work when you put it back and run the wheel in gear, then look at the impulse sending wheel inside the RD.

Using a led torch to see what you are doing, you should be able to just see it through the sensor hole, gently prod it with a small screwdriver and if it rotates free it has come unstuck and that is your problem. Well actually they are not stuck but lightly pressed on. Unfortunately you have to go inside the RD to fix it by doing some dismantling, replace the 'impulse sending wheel' or fix the old one on with Loctite bearing lock if it is not that loose.


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