195 open (250hp) Running hot....

[FSH 210 Sport]

Confirmed with my friend, this is what he said when he saw the pictures.

Definitely raw water intrusion into that exhaust

It’s a grip for sure to get rid of the cat, but if it’s leaking can you even get the replacements? Seems like the best way to go would be to eliminate it with the straight pipe and the re flash.

So you are saying in the picture below we are looking towards the engine and the cat?

 

[aemkay]

Confirmed with my friend, this is what he said when he saw the pictures.

Definitely raw water intrusion into that exhaust

It’s a grip for sure to get rid of the cat, but if it’s leaking can you even get the replacements? Seems like the best way to go would be to eliminate it with the straight pipe and the re flash.

So you are saying in the picture below we are looking towards the engine and the cat?
View attachment 245594

That is looking backwards from where the waterbox normally sits into the exhaust housing that has the cat in it... (let around the corner of that tube you see). That housing is raw water cooled. The raw water enters in the double walled exhaust system at the header, goes through the double walled cat housing and the exits at the end of the cat housing "around" the still "dry" exhaust stream into the waterbox... Here is a picture of how that looks:



The O2 sensor sits in the "hole" you see on the top, the raw water sprays form the 4 small holes around the center pipe piece, the pipe is the still dry exhaust stream. All together is inside the waterbed when installed. The clamp sits on the last piece of full diameter before the pipe gets smaller. . It's all very short, so that part of the exhaust ist basically constantly in a "raw water fog". Even on a brand new boat as far as I understand. While the boat is running, the exhaust pressure basically blows away that fog yet swirls will still be there (it blows into a box full of water) and the moment the engine stops, the warm/hot waterbox condensates in the actively cooled and therefore cooler exhaust housing. At least thats what I've been told and technically (I am an engineer) that makes total sense. So to sum this up, I think my scenario is possible without a leaking cat housing yet I can't rule that out completely yet.

 

[aemkay]

Here is a good picture of the Rotax JPS system with cutaways:

 

[FSH 210 Sport]

Confirmed with my friend, this is what he said when he saw the pictures.

Definitely raw water intrusion into that exhaust

It’s a grip for sure to get rid of the cat, but if it’s leaking can you even get the replacements? Seems like the best way to go would be to eliminate it with the straight pipe and the re flash.

So you are saying in the picture below we are looking towards the engine and the cat?
View attachment 245594

So yes, this picture is looking towards the cat and the engine after that.

The camera is pointing the way the red arrow is pointing.

 

[aemkay]

correct… and where the arrow ist, that black/cast exhaust piece is already “inside” the waterbox when installed (there is only a rubber coupler)