What parts from a ‘77 Evinrude 85 are interchangeable with a ‘73 Evinrude 115?

[Cconway]

I know that the electrical components are all the same, but I was wondering if the carburetors can be swapped…

 

[jimmbo]

The Carbs on a 73 115hp are larger than the carbs on a 77 85hp, as the 115 has about 8-9% more displacement than the 85, and have a different Fuel Delivery Curve, based on the expected airflow, which will degrade the overall Boating Experience. Instead of a motor that responds to the Throttle smoothly, a jittery, ill tempered, motor that can be a pain to use. The Linkages may also be different, as may the Cam on the Armature Plate.

 

[Cconway]

The Carbs on a 73 115hp are larger than the carbs on a 77 85hp, as the 115 has about 8-9% more displacement than the 85, and have a different Fuel Delivery Curve, based on the expected airflow, which will degrade the overall Boating Experience. Instead of a motor that responds to the Throttle smoothly, a jittery, ill tempered, motor that can be a pain to use. The Linkages may also be different, as may the Cam on the Armature Plate.

Thank you. I appreciate your help

 

[Cconway]

The Carbs on a 73 115hp are larger than the carbs on a 77 85hp, as the 115 has about 8-9% more displacement than the 85, and have a different Fuel Delivery Curve, based on the expected airflow, which will degrade the overall Boating Experience. Instead of a motor that responds to the Throttle smoothly, a jittery, ill tempered, motor that can be a pain to use. The Linkages may also be different, as may the Cam on the Armature Plate.

Could I swap the bowls and jets and use the ‘73 carbs with the ‘77 bowls if I swap the jets out?

 

[jimmbo]

There is more to a Fuel Delivery Curve, than just the Jets.
Are you just swapping the Bowls, or are you putting the 115 carbs on the 85hp, or vise-versa. While the both carbs use the same Gasket(rebuild) Kit, their are a lot of Differences.

 

[Cconway]

There is more to a Fuel Delivery Curve, than just the Jets.
Are you just swapping the Bowls, or are you putting the 115 carbs on the 85hp, or vise-versa. While the both carbs use the same Gasket(rebuild) Kit, their are a lot of Differences.

I think my issue is my float height. I’m also certain that the aftermarket kits I used were trash. I got the new OEM kits in and am going to give it another go, leaving my floats slightly elevated at the free end.

 

[racerone]

What is your 85 HP motor doing / not doing ??