outdoorsman10
Seaman
- Joined
- May 14, 2010
- Messages
- 73
That is the "Idle Relief Vent."
When the boat is at rest or moving slowly, the exhaust snout is buried very deeply in the water and backpressure can build up to the point where the engine will idle poorly or even stall. Under these conditions, exhaust comes out this tube (along with cooling water) and relieves the backpressure, improving the idle.
No, it is not a stupid question--do not feel dumb