I found the smoking gun in my overheat issue. David Bartlett ended up being spot on with this one. He had a 18hp Fastwin with the same issue as he mentioned in his earlier post. As I said I am going through all the possible spots for blockages. It ended up being a complete blockage inside the water pickup in the exhaust snoot. It was between the screen and the open area behind the side cover. There was also a bunch of crap behind the cover that was not allowing water to get where it needed to go. The holes in the side cover were pen which allowed it to pump great while sitting still, but while underway not so much. That’s all cleaned out now, but the weep hole that let’s the water and unburned fuel oil and stuff drain out of the L/U is still blocked. Trying to get that opened up. Once that is open I can start putting it back together when I have gaskets.
Here is what I found behind the side cover by the water pump.
Lesson learned.. ALWAYS check this before trying to run a motor you haven’t been COMPLETELY through on the boat.
OldJohnnyRude on YouTube