How do you tell how many poles and outboard has for tachometer?

[outboardnut]

I've got a dyno, and been hooking up the tach to different motors.

I still havn't found a good way to determine how many poles different motors have. I have a cabinet full of seloc and clymer manuals but it seems that they don't touch on the subject.

The dyno has 10/12/20 pole settings.

Right now I am working on a 72' 85 HP Evinrude and found on the forums it was 12 pole for the 100 HP in that era so I'm guessing it is the same?

 

[R.Johnson]

Re: How do you tell how many poles and outboard has for tachometer?

Count the pole winding's, divide by two. The winding's being the extended poles on the stator ring.