Condensation in speedo and tachometer

Discussion in 'Airheads' started by Saltwater, Apr 17, 2013.

  1. Saltwater

    Saltwater Adventurer

    Joined:
    Dec 21, 2011
    Oddometer:
    17
    Location:
    Washington State
    I am finally getting some use out of my 1978 R80/7 mini storage queen. I purchased it a year ago, and have refurbished cosmetics, some mechanicals too. <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:eek:ffice:smarttags" /><st1:City w:st="on"><st1:place w:st="on">Palo Alto</st1:place></st1:City> cleaned and inspected the stock speedo and tach; installed new rubber eyebrow rings, spiffed them up. Moisture keeps condensing on the inside of the glass of both instruments. The bike is stored inside my shop, which was constructed a few years ago, so it is heavily insulated and weather tight. I rode it for work travels all day yesterday and the moisture never cleared. While parked on the center-stand in the shop, there is never any condensation on the glass. Finally, I just installed a used Parabellum Scout fairing purchased off of Ebay; there was condensation when it was naked, and also with the fairing. The bike has never been ridden in rain. Within about five minutes of starting a ride, the condensation appears.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
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    Any ideas? Anyone else experience this condition?<o:p></o:p>
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    Thanks, Brian
    #1
  2. bpeckm

    bpeckm Grin!

    Joined:
    Apr 2, 2008
    Oddometer:
    7,148
    Location:
    Road Island
    Condensation is water moisture that reaches its saturation point, which is low in lower temps.... you being in the NortWet, the air is probably HEEEUMID....:eek1 .... very. ...and when you come out of a relatively-warm garage, it finds that nice cold glass on which to condense....

    You might try using a light (I use an outside spotlight bulb) in a clamp-on base, and set it up to keep the instrument pod warm overnight.. It would drive out any extra moisture (warm air can hold more moisture, so it evaporates, and then migrates to an area of less saturation. Physics of Air, we studied it in engineering, 'way back when....)

    There will be a certain amount of moisture in the air, and the spring/summer transition causes a lot of condensation....

    :D
    #2
  3. Plaka

    Plaka Brevis illi vita est

    Joined:
    Jun 19, 2010
    Oddometer:
    4,629
    real problem on early clusters. They changed the venting a few times. You could try replacing the main gasket (cheap) and checking the condition of the vent screens (or the presence of them). Cat Crap or similar on the inside of the "glass" may help some. You could also dry them totally (silica gel or cornmeal treatment) and see how long it takes to come back.
    #3
  4. caferacerturkei

    caferacerturkei Adventurer

    Joined:
    Apr 6, 2013
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    turkei
    #4
  5. Plaka

    Plaka Brevis illi vita est

    Joined:
    Jun 19, 2010
    Oddometer:
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    #5
  6. caferacerturkei

    caferacerturkei Adventurer

    Joined:
    Apr 6, 2013
    Oddometer:
    19
    Location:
    turkei
    so hard :eek1
    ok ty
    #6
  7. Stan_R80/7

    Stan_R80/7 Beastly Gnarly

    Joined:
    May 12, 2012
    Oddometer:
    2,484
    Location:
    VA
    I had a similar problem with my R80/7 instruments. Particularly, moisture would condense on the tachometer lens. Notably, the tachometer behaved erratically on occasion.

    I took the cover off and sprayed electronics parts cleaner on the circuit board. That fixed the erratic tachometer swings. Taking the cover off in winter (when the air in the house has low humidity) and reassembling seems to have fixed the lens condensation problem.

    Fundamentally, you have moisture in your instrument. When the weather is cool enough, this moisture condenses on the lens which has a temperature below the dew point of the humid air. Warming the pod up with hair dryer is worth a try and may help. Alternately, taking the pod off, removing the covers and putting some silica gel packets (not loose silica gel) in the housing for day or two will remove moisture.


    Good luck!
    #7
  8. acap650

    acap650 acap650

    Joined:
    Apr 10, 2006
    Oddometer:
    924
    Location:
    Western PA
    A friend use to use small dessicant packs inside his K-bike instrument housing as they were prone to condensation and failure.
    #8