Was running my Yamaha F225 the other evening (idling to charge battery while doing some boat tidying) and after about 5 minutes noticed what looked like smoke coming from the back of the engine.
On closer inspection it turned out to be steam coming from water spitting out of what I believe is an exhaust port on the the rear of the engine just above the water line.
Never noticed this before...is it normal for water to be spitting out of this port and should it be steaming? Tell tail was flowing correctly and didn't seem over hot. Didn't get a chace to give the boat a run out, but am worried something might be amiss.
Water comes out of mine at full chat. Chances are what you thought was steam was exhaust fumes mixed with the water coming out of the hole. If no alarms were going off and the tell-tale still felt cool(ish) then I'd put it down to that.
It is alarming, but normal, I think. I notice my F115 does this when the temps are fairly low. I also seem to notice it more when the sun is at a lower angle (morning and evening.)
Our F80 does it, as I understand its to relive pressure from the exhaust, its most likely when you were moving round the boat it will have gone below the water line briefly, then the water evaporates, making steam obviously.
