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Thread: 503 Twin Spark Taco/Rev counter

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  1. #1
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    Post 503 Twin Spark Taco/Rev counter

    Hello everyone


    I am struggling to find a Taco/Rev Counter which will read a twin spark 503 accurately.

    A digital two stroke taco off ebay with adjustable ignition timings doesn't work. It reads 6000 at tick over which i know it isn't doing.

    i have got the Revs near the mark with a vibrating wire taco but i want it spot on and permanently mounted in the craft.

    i have only every used a points ignition 503 before and the taco from that obviously over reads too.

    I was wondering what everyone else uses.

    Thanks guys

  2. #2
    Very active > 100 posts Club Member
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    Default Re: 503 Twin Spark Taco/Rev counter

    http://www.tinytach.com/



    Quote Originally Posted by Bearwood View Post
    Hello everyone


    I am struggling to find a Taco/Rev Counter which will read a twin spark 503 accurately.

    A digital two stroke taco off ebay with adjustable ignition timings doesn't work. It reads 6000 at tick over which i know it isn't doing.

    i have got the Revs near the mark with a vibrating wire taco but i want it spot on and permanently mounted in the craft.

    i have only every used a points ignition 503 before and the taco from that obviously over reads too.

    I was wondering what everyone else uses.

    Thanks guys

    Wouter
    aka Hoverholic

  3. #3
    More than 30 posts! Club Member
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    Default Re: 503 Twin Spark Taco/Rev counter

    Quote Originally Posted by Bearwood View Post
    Hello everyone


    I am struggling to find a Taco/Rev Counter which will read a twin spark 503 accurately.

    A digital two stroke taco off ebay with adjustable ignition timings doesn't work. It reads 6000 at tick over which i know it isn't doing.

    i have got the Revs near the mark with a vibrating wire taco but i want it spot on and permanently mounted in the craft.

    i have only every used a points ignition 503 before and the taco from that obviously over reads too.

    I was wondering what everyone else uses.

    Thanks guys
    Some tacos need to be wrapped around a ht lead from both coils to get an accurate reading so possibly try that?
    James Eddy
    (Formula Camera)

  4. #4
    Extremely active > 250 posts! Scrutineer
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    Ewan Black's Avatar
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    Default Re: 503 Twin Spark Taco/Rev counter

    I find tiny tachs read double up to about 3500, probably due to ringing in the circuit. Above that they seem to read ok
    I'r Gad!

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