68 Johnson 55hp - thermostat and thermo switch question

[DWM76]

Hi all, steady progress on the rebuild. Couple questions:
1) thermostat - 143 or 160 degree? I tested the thermostat in the unit (pot of water) no action at boiling temp so need to replace. I have read the 160 degree might be better than the 143. Thoughts? If a 160 is better anyone know a part number for one that is the same size/fit?
2) There was no thermo switch (the one to the choke solenoid) What are your thoughts on replacing or not? I have read the thermo switch can cause performance issues when it chokes unessisarily. Thoughts?

Thanks for your informed opinions and help.

 

[F_R]

Thermal switch can be eliminated by connecting both choke solenoid wires to the red&white wire coming from the remote choke switch. The choke is then totally under the driver's control.

Not sure what the 'stat specs were that year.

 

[DWM76]

Thanks F_R. I like that plan. I'll dig into the thermostat question some more. Another thread I read mentioned running a 160 degree helps with atomizing the fuel for cleaner and more efficient combustion, due to the higher operating temp. Anyone else hear anything similar? I would think if that were true newer motors would have 160's but being new to boats I have no idea.
Thanks.

 

[F_R]

Well sure, that theory is common to all engines, not just outboards. That's why cars run at around 190 degrees. Now the rest of the story: In my own personal opinion, that little bit of difference in temp won't amount to a hill of beans in performance of your outboard. Put the correct thermostat in it. P.S., I'm not an engineer.