Tachometer Poles 1978 140HP Evinrude

[sammons]

I bought a tachometer for this motor does anyone know how many poles this needs to be set on to make it work?

 

[Rudy Brown]

Re: Tachometer Poles 1978 140HP Evinrude

12 poles I believe.

 

[Barnacle_Bill]

Re: Tachometer Poles 1978 140HP Evinrude

It should be set on 6P.

 

[HighTrim]

Re: Tachometer Poles 1978 140HP Evinrude

6p, this may help. Tachometers read off the alternating pulses from the stator. Tachs have rotary switches on the back that set it to different numbers of coils in the charging circuit, times two because there is a positive and negative pulse for each coil for each cycle. Tachs measure pulses.

http://ww2.tflx.com/pdf/obtach~1.pdf
http://ww2.tflx.com/PDF/99320.pdf

Wow, 3 at once.