This will provide a very effective seal, and when mounted on the bike (especially on an RS or RT) is virtually impossible to find (and if you do it neatly – it looks like it belongs there). Then using HIGH QUALITY (3M can’t be beat!) electrical tape – run a single layer of tape over the joint between the 2 halves. After you add the vent above, and reassemble the cluster – carefully replace the useless “O” ring in the groove between the halves (it isn’t REALLY an “O” ring – it’s a foam ring.). This hint came to me from England – and if they don’t have moisture I dunno who does. Disassembly of the instrument is recommended so you don’t drill into the guts. A single hole drilled in the back cover of the instrument cluster between the rows of pins will work fine, and be in a spot that doesn’t get wet.
It isn’t necessary to go the gore-tex route (although this would be nice). Since these instruments are known to have moisture related problems, I decided there must be a cure. My ’85 K100RT would fog the instruments if there was a cloud within about 100 miles when I got it. It this doesn’t fix your problem, I would be very surprised.Įarly K Instruments – keepin’ em dry and working Let the paint dry, and then make sure the paint between adjacent pins is scraped away, or you may get a short. The solution to this it to scrape away the corrosion, very carefully, and buy some rear window defrost fix-it paint from your local auto parts store, and paint each pin carefully. The next time it went intermittent, about 1 year later, I took apart the speedo unit, and noticed black corrosion between the 24 pins on the back of the unit, and the flexible copper circuit tape. I cleaned it and voila it worked, for a while. I finally found that the little connector that is located under the right side cover, a 2 pin connector, was crudded up, thus the intermittent problem. I have taken it apart, cleaned everything, to no avail. I have experienced all of the intermittent problems previously mentioned regarding the speedo on my K75. Subject: BMW: Re: BMW K75 Intermittent Speedometers I’ve only been into it to replace a burned out bulb. The new Gore-Tex Motometer modules supposedly have improved contacts, and the speedo connection is screwed onto the rear of the speedo, eliminating (or at least greatly reducing) vibration-induced loosening the the connector. Hell, he may get you a new cluster courtesy BMWNA just to avoid the hassle of working on yours! If the arm is unmodified, you will need further disassembly including removal of the instrument assembly from the bezel cover, and them removal of the speedo module itself–all this to get to the contacts! It can be done, requires patience and dexterity, but if you’re intimidated by all this have your dealer do the procedure. If yours has had this done, you should be able to carefully pull the connector back and off the speedo to service the contacts. Early speedo connector arms had a service bulletin performed that actually called for sawing the arm in two, then cementing the connector to the speedo with RTV. What you’ve got to do is separate the connector, carefully bend the female contacts tight again, and reassemble with perhaps just a SLIGHT amount of copper anti-seize compound on the male pins to assure long- term continuity.Īt this point it will be easy or hard on you. Corrosion can form between the male pin and female contacts, or the female contacts lose spring pressure on the male pin. The speedo female-side contacts are usually the culprit. With the speedo to your right, you will notice a plastic arm with a printed circuit run that plugs into the speedo input connector. Remove the module back cover being very careful to not damage the gasket. Remove all the perimeter phillips screws. Remove the entire module from the bike and lay it on a towel, face down on your work bench. Intermittent speedos are usually caused by a fault in the internal connector to the speedo subassembly. New modules are identifiable by two small Gore-Tex vents on their undersides.Īssuming you’ve got the older type and can’t get it replaced for free, try the following: Nothing really fixed the problem until Iron Horse in Tucson replaced the entire instrument module under warranty. Dan Eggert asked what can be done to fix Motometer speedometers on Ks:ĭan, I had numerous (I think 4 or 5) speedometer failures soon after I purchased my K75S new in ’87.
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