doing engine swap....

have older style tachometer (4-inch diameter from pre 1996), and more importantly (and unfortunately) have a 4 prong stator. Based on the stator, I'm guessing the old tach is a 4-pulse.....

anyways, I have a newer tachometer (5-inch diameter, PN 0620-237) used in most sleds from 2000 - 2002. This is a 12-pulse tachometer

The older style tach works, but doesnt fit in the new sled because its diameter is an inch too narrow. With the new tach hooked up it recognizes RPMs, but they are minimal (ex: idles at about 200 and at WOT at about 3000), which are both obviously way off the mark.


I've had two thoughts, hoping somebody can help me out:

1) a 5-inch diameter tachometer that is a 4-pulse (or that would fit my engine)......if this exists, somebody throw me a bone

2) it is possible to re-calibrate the 12-pulse tachometer to work with the 4 prong stator??? I know all tachs can be calibrated, just wondering if this could be re-calibrated...any thoughts helpful


then of course lastly I could just throw in the old tach and re-work the fitment somehow.

Any comments helpful.....



heres pictures, old stator first (the one i have), then newer one (the one i dont have)

basically you have 2 tach's..
twin & triple
if you show low , you have a triple tach on a twin
if you show high,you have a twin tach on a triple
been there........

Arctic Cat has two tachs that they have used, but they are not twin and triple.
They are 4 and 6 pulse. The way you find out what you have is to count the magnets on the inside of the flywheel. If your flywheel has 4 magnets, you will need tach part number of a 0620-144, if your flywheel has six smaller magnets inside you will need tach part number of 0620-203.

click on the links below, the top link is a four magnet setup,

and the lower link is for a six magnet setup.

Once the link opens up, Click on the "where used on any model" a window will
open up, that will tell you what tach will fit your application. If you get a tach off any of the models listed in that link,
it will work on your sled.

Mike










http://www.brownsleisureworld.com/frame.cg...part%3D0620-133



http://www.brownsleisureworld.com/frame.cg...part%3D0620-203

this is not the case, I am 100% certain that the tach in the sled (that is reading extremely low) is from a 2-cylinder 440 engine




OK - what you're saying is making good sense, it is the flywheel that is important for tachometer readings, not the stator like I originally thought.

However, I still have one question - you said that the tach number will be either

0620-144 for a 4 pulse

or

0620-203 for a 6 pulse

the problem/interesting part is that when you click on 0620-203 it says that it has been replaced with 0620-237, which is a 12 pulse tachometer, says so right in the description





anyways, the tachometer in the sled right now is the 0620-237, so according to what you're saying, if that one isn't working then I must have a 4 pulse and need 0620-144

right?

They replaced it with that 0620-237 part number for one reason, It doesn't say arctic cat on it any more
99 was the last year for that., They call it a 12 pulse just for that reason to keep it straight, but it is a 6 pulse
If you look at the interchange, it replaces the six pulse tachs also

Well very cool, pretty sure that I've got it figured out. Thanks for straightening me out on that, I appreciate it. Just need to get myself a 4-pulse tach now.

What sled are you trying to put the 5" tach on?? Cat made a bunch of different versions (like 4 or 5). I replaced my 93 WC with a 5" but had to get a specific one. The old man also did his 94 WC fulie but I think it was even a different tach part #.

according to the discussion above, it would seem i should just get the 4-pulse tach...

0620-144

What sled is it going on??

The engine it will be used for is a 1993 wildcat 700.......


the sled chassis it is going on will be a 2000 snopro (zr440) chassis

That is the exact same sled that I had with the 5" tach retrofited on it. I will look and let you know the part number on the back of it. Carb model (not EFI) correct?

All the part numbers you posted are incorrect. If you are using a carbed motor from a 93 WC700 and you want to go to the large 5" diameter gauges then you need part #0620-132. I know this part number will work 100% gauranteed. :beerchug:

Trust me I know, 3rd one was a charm. :doh:

P.S - it is a direct plug in. :beer:

I actually think that the tach discussed by snow800 and your tach are both 4-pulse tachometers that would work just fine. Also, I think that there are 3 different variations of each, all that would work.

Anyways though, I suppose if the tach you're using is tried and true, there is no reason to try and get another tach. Thanks again for the help.

Tony

No use reinventing the wheel.

I when thru a lot of research and several trials before I ended up with the right tach. I guess if you want to go through the same you could try the other part numbers. The dealer I was working with on this know A LOT about Cat's (ie: Arnie's Cat House) and he said there were a bunch of tachs that were for 2 cylinders but there were different poles/pulses for each. And this guy knows his shyt.

There is a lot of different part numbers for tachs,
Since the tachs come with the wiring, it may vary from model to model as if the plug fits in the harness.

Also if you have a EXT EFI tach, it may have a battery light in the tach that a carb ZR doesn't giving it a different part number, but it will work and read right.

I have a tach out of a 2002 ZR 500, you look up what it fits on Browns and it says that it is the same as the ZR500 and the ZR 440 snopro. That is because it has a idiot light in it that says "Check Sensor" (pipe)

Those two were the only models to have the pipe sensor.

The truth is does it have four pulses to equal 1 rotation or 6 ??

That is how your tach reads and works.

yep, I hear ya.....both types of 4 pulse tach certainly should work

we'll try to find a tach thats tried and true, go from there, maybe go otherwise if I can't find one of those for a good price.



either way, thanks a lot guys I appreciate the help and based on this discussion I'm sure I'll find one that works. thanks guys