Originally Posted by dwarren1919
Boat runs fine until it gets warm and then the port engine will shut off and the alarm will go off. Starboard engine continues to run just fine. The port engine will start right back up with no problem. Really only happens at slow speed under 5 knots.... when I'm full speed have no problem what so ever...
I just re-read the post. Does the engine stall, and THEN the alarm goes off as a constant beep? If so, I believe that is normal. The alarm is probably the alarm 'test' mode similar to when you initially turn the key to acc. If I recall the purpose is to clearly notify you that the engine has stalled and is no longer running. You state that you can restart it wiithout any issues and can run at higher RPM's without any issues.
This is a 99, so I assume you have a carb. Could this be a situation where the choke is not opening preoperly when the engne warms up, causing a rich condition? Or the jet is partially clogged so when the choke opens it creates a lean condition? Have you tried slightly increasing the RPM's after the engine has warmed up a little bit, but not all the way. I wonder if giving more fuel when the choke opens prevents the engine from stalling?
Just a thought. If that doesn't work, I'd still be looking at the easy stuff next, like car next.