Help...ZX7R Tacho Issues...Help

[Maddog]

Hi all,

Was hoping someone out there may be able to help..

Pulled the dash out of a zx7r and put my old race dash in..Which was working fine when last used.(also from a zx7r)

The problem I'm having is the tacho is reading approx double the revs...

I have plugged the tacho from the original dash back in and it seems to be displaying a true indication of revs..

So do you think the tacho is buggered or may need recalibrating....

Also does any one have a tacho like the one in the pic lying around there shed just in case i need another one...
I believe it is out of an earlier model ZXR

Thanks Maddog

[Stace]

Have you run that tacho in that bike before Maddog?? If it's off an earlier ZXR and your putting it in a later model ZX-7 then that could be where your problem is

[Maddog]

Stace,
I haven't run it in this bike before...
However it was used previously in my old zx7r with out any issues..

[Maddog]

Perhaps i should get one of these...

[Stace]

Perhaps i should get one of these...

Bloody oath mate. Go for that little bugger. Stuff the standard one lol

[Maddog]

Does anyone know for certain if a standard road dash in a zx7r uses 1 or 2 coils to the feeder wire on the tacho.......Also does a 92 zxr750 tacho use 1 or 2 coils

Without checking it out, my theory on this issue is...
Standard dash....Tacho wire in loom splits to both coils...
Race dash.........Has a 92 zxr750 tacho runs on 1 coil....

I'm thinking the old bike when using race dash may have been modified to use 1 coil to feed tacho
(hence the reason it was fine on the old bike but reads double the revs on current bike)

Confused...??...dont blame you......cause i fuggin am
Any way I'll get back to the shed at some stage and delve a bit deeper