[Ducati] 998 tachometer probelms

[mike major]

If the tach on your toy is electrical instead of mechanical then it is
basically a well dampened ammeter that measures square waves (all the
same size) triggered by one of your ignition circuits.  If it works
fine on start up, with the idle speed indicated is at about the right
range on the dial I'd guess that the basic tach is OK but when you
start riding something is working loose.  If the bike is starting and
running fine I doubt it is a problem with ignition or battery.  You
could hook a separate tach to the feed from the ignition to see that
it is generating good triggers but it sounds to me like you need to
troubleshoot the wiring.  Good luck, Moonbeam

On Nov 18, 2007 5:12 PM,  <pjdemoga at aol.com> wrote:
>
> Hi Folks:
>
> I don't know if it just started or if it'd been screwed up since?I bought it 500 miles ago (with only 3700 miles on it), but the tach on my 998s works fine on startup, then while riding, the needle fluctuates wildly then drops dead. I've been too scared to look at the speedo or tach until lately, so I don't know if the problem existed since I bought it.
>
> The Haynes manual says it could be the ecu, the tach, or (hopefully) the battery.? How do we check short of buying a new battery? This bike came with Termis (half system) and cams (Ducati Performance?) and a chip. I'm about ready to store it for the winter,?and I'd love to sort the problem before then.
> I've read that a subpar battery could lead to fried electrics.
> Any wisdom on this?
> Paul D
> 2002 998s Bayliss
> 2000 853
>
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