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Nissan NS8B water coming out of upper exhaust port

H

hungyzerglin

New member
I have a used 1990s NS8B 2 stroke 2 cylinder 8HP that is expelling a lot of water through the upper exhaust port on the drive shaft housing, see pic/vid:

https://youtu.be/sLfe1hF0KiY

6hGlpS1.png

I bought this motor used and converted it from a ultra long shaft to short shaft. I replaced the gaskets between the powerhead and motor cover and between the motor cover and the drive shaft housing (both were large rectangular gaskets), but it still seems to expel a lot of water through that port, which my other 2 stroke outboards don't seem to do. This motor has a thermostat, and I've heard stuck open thermostats can cause water to shoot out the exhaust. I believe it still has the original thermostat as I didn't change anything in the powerhead. Is this normal or should I try replacing the thermostat or something else?
 
That is the idle relief port. Normal discharge. That will go away at speed, as the exhaust is pulled out of the prop hub.
No, the stat has nothing to do with it.
 
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