ΙΜΟ-100R300 speedo problem

Discussion in 'GS Boxers' started by GEOF, Jun 18, 2017.

  1. GEOF

    GEOF Adventurer

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    my touratech tachometer just died. I checked the wiring but i didnt see any cuts. I also checked the magnet and the sencor.
    any ideas?
    #1
  2. Road Warrior

    Road Warrior Valley BMW Riders member

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    HI Geof.

    The magnet and sensor have absolutely nothing to do with the Tachometer. Only the Speedo.
    If the tach is not working, check the IMO wiring hookup to the bikes wiring for the tach.
    #2
  3. GEOF

    GEOF Adventurer

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    My mistake. I mean the speedo has the problem.
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  4. Road Warrior

    Road Warrior Valley BMW Riders member

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    Ok, that makes more sense.
    Have you done anything on the bike that would have changed the gap between the magnet and sensor.
    That's the first thing I would check and possibly readjust. You may be on the "hairy edge" of exceptable gap.
    #4
  5. GEOF

    GEOF Adventurer

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    I have changed the weels but it worked fine with the new ones. It started to have some problems and then it just stopped. Now it shows zero.
    #5
  6. GEOF

    GEOF Adventurer

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    I wonder if there is a way to test it before i spend money and change the sensor
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  7. Road Warrior

    Road Warrior Valley BMW Riders member

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    The signal from the sensor can be checked with an oscilloscope but I expect you don't have such a piece of test equipment. Failing that you could hook up an analog multimeter, set on real low voltage, and see if you notice any movement of the needle when you spin the wheel by hand. It will be very slight so you'll have to watch very carefully. Either check requires you to disconnect the sensor from the IMO junction box and connect to the wires from the sensor cable to your test gear.
    As I've already said, try changing the gap between the sensor and the magnet. The closer they are to each other the better.
    Have the wires from the sensor rubbed through anywhere around the wheel. Also, check where the sensor cable goes from the front wheel to the bike frame. Maybe after time the constant flexing at that point may have broken the wires inside the cable.
    If you're not able to do any of this, a new senor may be your only choice.
    #7
  8. GEOF

    GEOF Adventurer

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    Thank you. I have already checked the gap, it seems ok. I am afraid that during the change of the weel maybe the sensor was too close to the magnet and with the rotation it damaged the sensor as i see a scratch on it. But i I will check the cable to to be sure.
    #8
  9. Unstable Rider

    Unstable Rider Moto Fartografist

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    One of those situations where a couple photos might be nice. . . :hmmmmm
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  10. GEOF

    GEOF Adventurer

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    I will upload some photos later
    #10
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  11. GEOF

    GEOF Adventurer

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    IMGP1654-1920x1280.JPG IMGP1659-2400x1600.JPG
    #11
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  12. Road Warrior

    Road Warrior Valley BMW Riders member

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    The gap looks good and the slight scuffing in your pic should not be an issue.
    Check the cable as I've said already.

    Good Luck !
    #12
  13. Unstable Rider

    Unstable Rider Moto Fartografist

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    Excellent pics--
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  14. overlander

    overlander Gravel Travel Tours

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    I'm surprised your IMO has worked this long! I've got a few of these in a pile that have all died painlessly but all dead just the same. Touratech USA doesn't have a clue as to how to repair them. I've replaced them all with the more compact and way more reliable trail tech versions.
    #14
  15. krellheat

    krellheat Milk Crate Challenged

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    I changed the battery on mine awhile back.

    What trailtech version are you using?
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  16. GEOF

    GEOF Adventurer

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    Well, something like that must have happened to mine.
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  17. overlander

    overlander Gravel Travel Tours

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    I've got the explorer on two bikes and the vapor on another. Except for the smallish screen (I'm old) it has all the same functions and proven dead reliable over many years and much harsh use. If some electronic genius (or a suitably motivated 10th grader) could figure out how to procure parts for the IMO, they could start a bustling business fixing them for all the despondent KTM 640 Adv owners out there.
    #17