Paul,
Rotax produce a guide to tacho problems which is available on line.
One of the solutions suggested is to solder a 100 or 200 ohm resistor across
the trigger coil terminals.
Fitting a 100 ohm resistor has proved to be effective in stopping
fluctuations above 5200 rpm for me.
Roger Anderson G-BXTD
----- Original Message -----
From: <europa@pstewart.f2s.com>
Sent: Monday, May 18, 2009 9:46 PM
Subject: Europa-List: Rotax tacho
>
>
> Some time ago I posted a query about the nonsense readings of our Rotax
> tacho.
> Have now got the TCU rpm output to compare. When idle (TCU about 1500rpm)
> rotax
> tacho not too far off (about 1700). When engine running at 2500 according
> to the
> TCU Rotax tach reads >4500! Any thoughts as to if this suggests a duff
> tach or
> a duff signal from the coils?
>
> Regards
>
> Paul
> G-GIDY
>
>
>
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