1959 Evinrude Fat Boy 50hp

[Mgman71]

Hi group. I have a 1959 Evinrude Fat Boy 50 Hp engine. Is there a way I can put a Tach on the engine ? Thanks in advance.

 

[jimmbo]

Yes, Tachs were used on Magneto Ignitions for Decades

 

[Mgman71]

Yes, Tachs were used on Magneto Ignitions for Decades

Any idea how I would hook one up, do you know that the 59 do not have coils. How would it be hooked up. Thanks

 

[racerone]

There is a coil inside the magneto !!

 

[jimmbo]

Here is a link to a 3rd Party Service Manual(one of the Better ones), it is a PDF, so it can be downloaded.

http://www.fiberglassics.com/library/images/9/91/Evinrudeservice003.pdf

You might have to resort to using an Inductive Tachometer. If you feel you need one to pick a prop, not to worry there are only two Props available for that engine, initially it was a 13 x 13, and later it was a 12 1/8 x14, both tend to yield similar rpms

 

[jimmbo]

Some pics of a Fat 50 I found a few years ago

 

[racerone]

A smooth running / powerful motor.-----But the reputation of an inefficient user of fuel.-----I can identify one by the smell off the exhaust !!

 

[jimmbo]

1/3 the fuel was burned, 1/3 was pushed out the Exhaust, and the last 1/3 was dumped via the Crankcase Purge Valves

 

[Mgman71]

There is a coil inside the magneto !!

I will check it tomorrow. Thanks

A smooth running / powerful motor.-----But the reputation of an inefficient user of fuel.-----I can identify one by the smell off the exhaust !!

i have owned this motor for 10 years have not noticed that much gas used… will what this year. Still would like to hook up the tach. Hope someone can help. Thanks

 

[jimmbo]

I have searching the Various sites with Documents on old Motors but haven't come up with anything. I would think one of the M terminals on the Ignition Switch, would be where a tach would be hooked up, but I am not going to say to do that just yet.

In my 1977 OMC Accessory Book, it shows two Tachs for Magneto Outboards, also useable on the 4 Stroke I/O's of the day.
Part # 172077 and #172926. So maybe an Automotive tach might work.

 

[Mgman71]

I have searching the Various sites with Documents on old Motors but haven't come up with anything. I would think one of the M terminals on the Ignition Switch, would be where a tach would be hooked up, but I am not going to say to do that just yet.

In my 1977 OMC Accessory Book, it shows two Tachs for Magneto Outboards, also useable on the 4 Stroke I/O's of the day.
Part # 172077 and #172926. So maybe an Automotive tach might work.

Thank you for looking around. If you see any other info please let me know.