That is a low speed exhaust relief port.
The main sea water flow should be exiting through the propeller hub at the higher RPM range. If not, then
I have a Yamaha 2.5HP 4 stroke that I'm replacing all the power head gaskets. For some reason I'm unable to separate the cylinder block. All the bolts
Well, its a term used quite commonly in these parts. The water is coming out of the ports below the drive, the ones that were designed to expel water
I am having turbo issues also. I talked with Doug at Acadiana Diesel here in in Louisiana. http://www.acadianadiesel.com I also talked with Turbo Supply
I have a 1984 Boston Whaler Sport 15 CC with a 50 HP Mercury 4-cylinder.
It had a 13 pitch prop that generated 30MPH, but WOT allowed Ron's at 6000...way