Tacho Doing Sill Things

Discussion in 'Technical Help' started by Gumboots, May 8, 2018.

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  1. Gumboots

    Gumboots New Member

    Aug 13, 2017
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    #1 Gumboots, May 8, 2018
    Hi i have a 2006 carb scrambler it had a triumph tacho added when i bought it. Ive had nightmare probs with electriks and replaced EVERYTHING. Bike goes great now But tacho is not working right. its fine at startup but soon goes dead.each time the motor drops below 2000 revs it wakes up then dies again.ive had the tacho checked and it is ok What do i need to do to fix it.
     
  2. darkman

    darkman Crème de la Crème

    Oct 26, 2015
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    #2 darkman, May 9, 2018
    It will be the ICU igniter under your seat :) give it a good wiggle and see if rev counter works, if it does then replace with a new one :)
     
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  3. Gumboots

    Gumboots New Member

    Aug 13, 2017
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    new zealand
    #3 Gumboots, May 9, 2018
    Hi thanks for that i have already replaced the icu unit with a procom one as all my electrics failled so i dont thinkits that as the bike goes really well. The scrambler didnt comeout with a tacho so this one has been added. it has worked well untill about 45k on the clock when the igniter at the alternator failled and was replaced all be it with only .4mm airgap insteadof 1mm any other ideas please
     
  4. Callumity

    Callumity Elite Member

    Feb 25, 2017
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    #4 Callumity, May 10, 2018
    Try feeding a wire (Black to merge with loom harness?) from the +ve terminal on one of your coils to the (red?) tacho +ve. The ECU feeds the tacho the same 12v pulse for each revolution of the crankshaft. I had similar issues with a dodgy igniter output and the tacho works fine.
     
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  5. darkman

    darkman Crème de la Crème

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    #5 darkman, May 10, 2018
    I am no expert but .4mm is small compared to 1mm, i would sort that out next if just to eliminate it. What we need is an expert lol.
     
  6. Callumity

    Callumity Elite Member

    Feb 25, 2017
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    #6 Callumity, May 10, 2018
    The ‘igniter at the alternator’ is the crank position sensor (a small coil)
    The correct air gap is .8mm although early ones were set at 1mm.
     
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