Swap the two sensor wires that come off the tacho sensor on the back of the
engine. In theory this should make no difference; but apparently does on
occasion.
I had a similar problem that occurred on a non-ROtax tacho, whereby the
reading was stable until about 3500 rpm, then went completely off the scale.
Solved with a series resistor in the sensor leads, which presumably dampened
the "ringing" in the circuit that was probably causing the problem.
Sensor-gap against the magneto checked-out OK, but I suspect that playing
with that may have effected a cure too.
Duncan McF.
----- Original Message -----
From: "Richard Iddon" <riddon@sent.com>
Subject: Europa-List: Tacho problem
>
> The Rotax analogue tacho on my 912S started flickering about on my last
> flight for no apparent reason. I have just test run the engine again
> today and it has ceased working altogether. I have checked that there is
> power going to it OK.
>
> I looked in the archive and find that some people have swapped a couple
> of wires around and solved the flickering problem but I can't work out
> which wires they swapped round.
>
> Can anyone enlighten me or offer any other solution to a duff tacho?
>
> Richard Iddon G-RIXS
>
>
>
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