Drag Specialties Tachometer problem

[illini_bri]

Hi all,

Got my '03 VTX1800C a couple months ago, looks like this is the weekend it comes out of storage This is my first post on the board.

I installed a Drag Specialties tach last week (with the help of this board - thanks!) and I'm having a wierd problem. The tach reads 1/2 of the proper RPMs. I hit the rev limiter at an indicated 2500.

Any thoughts? Faulty tach, wiring mistake? The label on the tach was wrong, so I had to make some assumptions about wiring (can't remember which went to which now).

Any help is greatly appreciated!

[beavis]

You need a Compufire Tach Adapter. It doubles the rpm's on single fire ignitions. My tach came with one. If you do a search you will find lots of info on it.

[JAT]

1800's have single fire ignition, need
http://www.hondadirectlineusa.com/vtx/p ... =998527887

illini_bri, question, do you have any needle bounce at idle?
Might get doubled with tach adapter. Think it's unavoidable with
Drag tachs due to single fire ignition & adapter.
I had major bounce at idle with Barons tach (& tach adapter).
Smoothed out at about 2Krpm. Couldn't handle the bounce at
idle and I went to an Autometer, hardly any bounce at idle.

JT

[bbossman]

I used a Compufire #60-3295 on mine . Had the same problem.

[illini_bri]

yeah, I do have quite a bit of needle bounce. I'm still deciding if I can live with it.

thanks all your help!

[DIRTBIKEDAVE]

I also use an autometer tach, no needle jump at all. I may be wrong,but I thought when I call them they told me the vtx1800 has a 1/2 pulse. honda dealer couldn't even tell that.If you cant get any help search for the autometer site and call them, they do have the right parts.