1977 Evinrude 115 need correct orifices

[batoven]

Greetings all,

I've inherited a 16ft Imperial tri-hull with a 1977 Evinrude 115 on it. Boat was originally bought by my Brother in Tucson, AZ in 1978. It has been sitting awhile and I now have it at home in Bellingham, WA. I'm in the process of rebuilding the carbs and I know I need to change the orifices due to it being the engine was manufactured to run correctly at 5000+ feet above sea level, and it is now at sea level. I'll be using it at sea level to 2000 feet above sea level. What orfices do I need to use in the carbs? They are currently 29 and 59. Its a Evinrude 115, model 115793S. It hs two of the Type II carbs. Thans you in advance!

 

[racerone]

I would NOT change them.---------------I suspect they were never changed to compensate for the 5000" elevation.-----Just leave them be and the motor will be happy !!!

 

[batoven]

I would NOT change them.---------------I suspect they were never changed to compensate for the 5000" elevation.-----Just leave them be and the motor will be happy !!!

Well I'll give it a shot. Hopefully it does run well.

 

[Tim Frank]

Greetings all,

I've inherited a 16ft Imperial tri-hull with a 1977 Evinrude 115 on it. Boat was originally bought by my Brother in Tucson, AZ in 1978. It has been sitting awhile and I now have it at home in Bellingham, WA. I'm in the process of rebuilding the carbs and I know I need to change the orifices due to it being the engine was manufactured to run correctly at 5000+ feet above sea level, and it is now at sea level. I'll be using it at sea level to 2000 feet above sea level. What orfices do I need to use in the carbs? They are currently 29 and 59. Its a Evinrude 115, model 115793S. It hs two of the Type II carbs. Thans you in advance!

Why do you think the motor was re-jetted or manufactured for 5000' elevation?
Maybe check the parts list and see what the OEM orifices are listed as.

Try it as is and see how it runs.
Per post #2, it may not be broke, and if it ain't....

Might be able to just go boating as it sits.

 

[racerone]

Well the jet sizes in post #1 are exactly what is listed in the parts book.-----So as I said ---" do not change them "

 

[Tim Frank]

Well the jet sizes in post #1 are exactly what is listed in the parts book.-----So as I said ---" do not change them "

Got it!
Might have been clearer if you had mentioned that you had taken the time to check what was spec'd as OEM.

I suspect that you do a lot of lookups that go unnoticed and/or unappreciated.

 

[racerone]

Folks just do not know how to look up simple stuff !!

 

[batoven]

When I pulled the carbs they were pretty dirty so I ordered two Sierra rebuild kits. The carb rebuild instructions tell how to adjust floats when the carbs are inverted, but not how far they're supposed to hang when re-righted. Does anyone know that measurement?

 

[Tim Frank]

When I pulled the carbs they were pretty dirty so I ordered two Sierra rebuild kits. The carb rebuild instructions tell how to adjust floats when the carbs are inverted, but not how far they're supposed to hang when re-righted. Does anyone know that measurement?

Can't see why it would matter and would be surprised if there is a spec....you are adjusting the "full" level. The "empty" level is never reached....hopefully.

 

[batoven]

That's what I was thinking too, except these are new floats as well, and they hang lower than the old ones.

 

[Tim Frank]

They probably hang lower than the bowl would allow when the carb is all together.