What is this wire?

[va3cgt]

I'm not having much luck with my 2014 Nissan 30 HP tach hookup. Bought a Tiny Tach and the readings seem to be erratic. I also have an old Honda tach made in 1999 which I tried to what I thought or think is the tach wire, and yes I supplied the 12 volts with no luck.

Or better yet what would the RPM be with the 9.9X11 pitch be?

 

[Sea Rider]

Welcome to Iboats,

4 strokes around 800, 2 strokes around 1000 at idle/neutral, what are your erratic readings ?

Happy Boating

 

[pvanv]

Welcome to Iboats,

4 strokes around 800, 2 strokes around 1000 at idle/neutral, what are your erratic readings ?

Happy Boating

Incorrect. The MFS9.8A3 idles correctly at about 950 RPM in gear.
The tach wires are white and yellow. For wired -- you must use an alternator tach (not an ignition tach), and it must be set to correspond to the correct number of alternator poles.

 

[va3cgt]

Sorry for not providing enough info. My Tiny Tach reads 4000-4100 at WOT, which I know is not correct. With my current pitched prop, 9.9x11 I was wondering what the WOT RPMs might be then I can avoid the whole tach issue all together. The purpose of this is so I can get another prop as a spare or maybe one that offers slightly better top end speed. Maybe a 12 pitch?? or a Spitefire??

I tried to post a pic but couldn't shrink it down enough for the web page. Hence the title, What is this wire. I'll try again in a lower resolution setting.

 

[va3cgt]

This wire. 2014 Nissan/Tohatsu 30 EFI. Tach wire??

 

[va3cgt]

Tach wire??

 

[va3cgt]

Something fishy with web site uploads. I get error messages but then they get posted....oh well. Sorry the duplicates

 

[pvanv]

Keep in mind that the MFS25/30 is a 3-cylinder. The tiny tach may not have a setting for that. We use the real Tohatsu tachometer, triggered by the white alternator wire, and grounded by the yellow wire.

 

[va3cgt]

OK Thanks. I thought something wasn't right.