Water Pressure SHO 225

What’s good pressure at WOT on a SHO 225? I noticed today I was at 13/14 running about 71 mph. It seemed low to me but I don’t usually pay attention to water pressure. Just had annual service done by dealer and water temp was 97, air was about the same. Anything to be concerned about?

Pretty close to where my 250 is.
At idle, it's terrible but my mechanic says that it's pretty normal. I watch the temp and it never has run hot in the years I've owned it. I'm over 550 hrs and it's never missed a beat.

Sounds about right. Another thing to pay attention to is when you start your boat it won’t squirt water right away. My mechanic says you should be patient and wait until water comes out before blasting off. He thinks it’s important because of the size of the engine block.

That is about where my 250 runs. Even in the heat of the summer I almost never get it to temperature where the thermostat actually opens. It takes a long hard run to get it there. In the winter I don't think I have ever opened the thermostat. When I first bought mine I had the same concerns listed above. I actually took it back to the dealer and said "psi is way low and it takes forever to start pissing water". Mechanic told me the same. That's normal. I'm at about 285 hours now and no issues, at least not related to the water pump or temp.

Your fine. Low pressure, high volume pump.

Appreciate the feedback.

Yep. I'm pretty sure it's only required 11 psi at wot. Some of them dont even register on a gauge at idle.

This is what I was told as well. But, mine gets around 10-13psi at idle and around 25-30psi at WOT.

There is a good chance you gauge is off. Are you sure it’s a zero when off?

Yes. The gauge is zero psi when off. If I over trim the motor, it will dip severely. When I raised the motor to 2-1/2” below pad, it dipped down to 10-15 psi on plane. I dropped the motor back down a half inch to restore the water pressure to it’s previous reading. I haven’t changed my impeller in two years, but I use the boat 3-4 times a week, year round and flush the motor monthly.

+1

Actually you shouldnt be BLASTING off EVER before your engine is up to operating temperature. Absolute minimum would be 100 if you wanted a number.

A cold piston will stick to the cold cylinder wall and scuff it or tear the top of the piston off destroying your engine entirely.

120 degree min operating temp with the SHO is what I was told by the Yamaha factory

Not doubting your word; just want to know. How do you know whether or not your thermostat is coming open or not? Do you have temperature gauges for each bank?

I can tell you from experience if one is stuck open say w debris that side of the engine will stay cold and it wont last long a blast off or two cold and youll hear some clanking.. Happened to me 17 hours from home...