Tacho Reading Double

Discussion in 'Technical Help' started by Nigellynch, Aug 13, 2019 at 1:12 PM.

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  1. Nigellynch

    Nigellynch New Member

    Aug 9, 2019
    3
    3
    Peterborough
    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
    149
    43
    sussex
    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
    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
    5,377
    800
    Grampian.

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

    dirty big hands Active Member

    Aug 4, 2017
    149
    43
    sussex
    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
    1,841
    750
    Nr Biggar
    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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