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Orange / blue stripe wires on the top coils ??

Trying to determine if there was a large repair job done here.------What make of boat ?-----That delamination does not look normal to me.----Looks like very poor bonding in that location.

In 1998 there were crossflows and loopers.----The TSL models are crossflows.-----1998 was the last year for crossflow.-----I have a 115 HP crossflow 25 " model myself.

Try a 17"

Looks to me that there might be more issues hidden.-----Is there a way to look at the inside of the hull where this damage has shown up ?

Correct.

You need to read that page on carburetor adjustment carefully.----Slowly and word for word.------At the very top it indicates that it is for the 2 ( 2 hp ) model with a low and high speed mixture needle.----Then near the bottom it switches for the 4 to 15 ( 4 hp to 15 hp ) models that just have...

Get the authorized local dealer to print out service bulletins with regard to jetting for high elevation running.----Dealer did that for me.

Can you not see that the page in the manual is for the 2 HP model and the bottom part of the page is for 4 to 15 HP models.----You need to reduce orifice size for the 4 high speed jets by 0.002".-----But first post your compression numbers on this 35 year old crossflow motor.----I am sure your...

Adjust a wee bit at a time to increase friction so it will hold up.----And get this, maybe the friction block needs a smear of grease.

You are beginning to learn I say.----Now lean the motor back like it would be on the transom of a normal boat.-----This all looks normal to me.

Can you see that the driveshaft and propshaft are NOT at 90 degrees to each other ?----Transom on a boat is not plumb , it is normally around 12 degrees.----It is NOT straight up and down.------Your motor looks normal to me.

I should have a look at the ones I have to verify this.----I don't imagine they made them " wrong " for nearly 20 years.

Driveshaft does appear to be at an angle.----But propshaft appears to be horizontal.------Part of the way these motors were designed ?----I would call it normal per post #4

I guess I have to repeat here.-----There are no mixture adjustment screws on a 1985 model 115 HP Evinrude !!----You need to find the correct manual !!

Remove cylinder heads and inspect.----It is always cheaper to repair if you can do the work yourself.----Finding a dealer that will rebuild is not easy.-----At $100 it adds up quickly.------These crossflow motors are famous for broken piston rings.

That nut is not part of the assembly shown in post #1

There are no mixture adjusting screws on these carburetors !!

The screw is not part of this assembly when it left the factory.----Where did you find 308824 for these parts ?

This sounds expensive.-----Next step is to remove cylinder heads.----Inspect cylinder walls.