Speedo adjustment

Discussion in 'Motorcycle Technical Discussion' started by Masospaghetti, Mar 2, 2005.

  1. Masospaghetti

    Masospaghetti Guest

    I think I know the answer already, but why not.

    I have a 1982 Yamaha DT80 enduro bike that has a speedometer from a
    DT100. The DT100 had a larger wheel diameter than the DT80 does, so the
    reading isn't correct. Is there any adjustment to compensate for this,
    or do I need to get a bigger wheel?
     
    Masospaghetti, Mar 2, 2005
    #1

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  2. Masospaghetti

    Masospaghetti Guest

    The sending unit is the original DT80 one. When you say they are about
    10% optimistic, would that mean the trip odometer would be 10%
    "optimistic" as well?
     
    Masospaghetti, Mar 2, 2005
    #2

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  3. Masospaghetti

    Masospaghetti Guest

    I'm not positive it is not accurate - it just "feels" wrong. Especially
    the odometer seems off.
     
    Masospaghetti, Mar 2, 2005
    #3
  4. Masospaghetti

    Rob Kleinschmidt Guest

    http://home.jtan.com/~joe/speedo.htm

    Calibrating speedometers for fun with a rusty spike and big
    ugly hammer.

    http://www.ibmwr.org/otech/speedo.html

    Slightly more elegant solution involves fiddling with spring
    tension.

    Not so sure you really want to try any of these experiments though.
     
    Rob Kleinschmidt, Mar 3, 2005
    #4

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