Tacho Reading Double

Discussion in 'Technical Help' started by Nigellynch, Aug 13, 2019.

  1. Nigellynch

    Nigellynch New Member

    Aug 9, 2019
    3
    3
    Peterborough
    #1 Nigellynch, Aug 13, 2019
    Has anyone encountered this issue, and suggest a fix. The rev counter is showing double the real revs !!!
    the bike is 1994 Daytona 900
     
  2. dirty big hands

    dirty big hands Active Member

    Aug 4, 2017
    185
    43
    sussex
    #2 dirty big hands, Aug 13, 2019
    The coils are starting to break down, if it's anything like a TBS.
    The revs are picked up from no.1 coil.
     
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  3. Nigellynch

    Nigellynch New Member

    Aug 9, 2019
    3
    3
    Peterborough
    #3 Nigellynch, Aug 14, 2019
    that was a bit of good advise dirty big hands, I swapped number 2 coil with number 1 and the tacho reads correctly.
    Ive ordered a new coil, however, can you tell me why the bike appears to be running fine even though the coil is not functioning properly?
    Thanks again
     
  4. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    6,029
    1,000
    uk
    #4 Sprinter, Aug 14, 2019

    Cos you caught it in time?
     
  5. dirty big hands

    dirty big hands Active Member

    Aug 4, 2017
    185
    43
    sussex
    #5 dirty big hands, Aug 14, 2019
    Not a clue!
    My rev counter was intermittent from when I bought it, but always ran a bit hesitant/lumpy at low revs.
    I changed all 3 coils, on the assumption that if 1 is starting to fail, the other 2 won't be far behind.
     
  6. Callumity

    Callumity Elite Member

    Feb 25, 2017
    3,358
    800
    Nr Biggar
    #6 Callumity, Aug 14, 2019
    It’s an oddity of tachometers that low voltage and poor connections can lead to high readings. A coil on the blink usually suffers a growing discontinuity in the fine windings......might explain.
     
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