Got my NEW genuine polaris tach off ebay, is it busted?

[mystahagy]

Well just got in the Polaris tachometer that I got off ebay. Was in original package, but had been taped back up looking as if it was opened briefly. Everything appears to be there, however upon closer look I notice the tach is stuck around 2k rpm. What's the deal with that. Are these things serviceable and perhaps I can open it up and reset the needle? Ugh, this sucks. Here's some pics.

Even my cat couldn't figure it out.


Old digital camera takes horrible pics, but you get the idea.

[ph2ocraft]

Split the box, attach it and fire her up I'll bet the RPM's show correcty.

[ph2ocraft]

I THINK on some of them at the rear was a rubber seal which could be removed and the needle adjusted.
But hook it up and see if it seems correct.

[ph2ocraft]

Come to think of it, if you attach the power and ground it will probably drop to 0 RPM.

[mystahagy]

Split the box, attach it and fire her up I'll bet the RPM's show correcty.

woohoo that's what I was hoping for. CDI for my 750 is coming in tomorrow, we shall see in the next few days! Might take a little trial and error, there's two different hookups for the 650 and the 750 according to the tach instructions, and mine's gonna be a 750 motor, with a 750 CDI in a 650 e-box. Thanks Al.

[mystahagy]

Touched power and ground, and tach smoothly went to zero just like ph2ocraft said. Disconnected it and the needle gently climbed again, which was interesting. Guess it's a wierd tach thing. But that's a relief, thanks again Al.

[ph2ocraft]

What are the differences?
It seems it should be
Yellow for tach signal
Red for switched power
Black for ground

[Bernie]

It was measuring your heart beat


Cheers


Bernie