No other water intakes that I can see. Unless it's a hole the size of a speedo port.
I started with the water pump, then began pressurizing coolant ports (outlets) from the bottom up, and then top down. Obstructions rules out, I went ahead and replaced the thermostats and the poppet valve. Then removed the lower unit and "muffed" it with and without the water pump. It's getting water, but, sure takes alot of pressure. Seems to want to bypass somewhere before the pump and come out by the prop.
Just making me wonder if somebody has removed something back in behind the prop. Maybe as a performance gain without realizing an adverse affect?
With the amount of water that seemed to be flowing out by the prop, I thought maybe it needed some backpressure at the exhaust or something of that sort that could only be supplied by lower unit submersion.
That seems to work (so far).
Just strikes me as odd that all the other boats I've had and friends (way too many)(boats, not friends).. all run on muffs just fine and it seems this one won't.
Water head pressure yamaha V-max?
Linear Mode
