Yamaha 4 stroke 25hp outboard not peeing.

I'd look at water pump install again. Drop the lower and make sure everything is good

Did you check to make sure pee hole does not have a clog

Yes, I ran wire up in it as well as weed trimmer line. I feel like it is a clog too or thermostat issue. I cannot really find where yamaha starts after the thermostat kicks in like my mercury used to do or if it starts peeing automatically once started.

I assume I would have to take it in to test for this? Or is there another way?

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No I have not done 100hr service. This thing only has 15hrs on it.

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I get that and I'm not religious about them, but a 2021 could have been built in 2020 so that impellar could be almost 5 years old. Could just be a bad impellar.

Ok. I am just going to take it in and have them figure it out I guess. I appreciate everyone’s help.

Try to figure it out. Even the most complex outboard (etech) still has a simple cooling system.

Couple things you might try if haven’t already

Hook up a water hose to the flush port and give it a good flush. Water should come out pee hole good and strong

Take the water intake screens off the lower unit and give a good cleaning. Sometimes crap gets clogged just behind them.

The water pump install is good. The old pump was in really good condition to begin with. After I installed the new one it does the exact same thing.

I have run thin wire and weed eater string up the peehole and nothing changes. Still dribbles out.

I did take the intake screens off and cleaned them out. They really didn’t have anything to clean out to begin with.

I did follow the line up to the block, but I didn’t remove the hose just yet. I may try that next. I was just trying to see if my weed eater string made it around the elbows on the hoses.

I have also hooked a hose up to the flush port on the side of the engine and it intermittently dripped out of the pee hole. I read where you shouldn’t have your engine running when hooked up to the flush port. It should only be running when you have muffs or if the motor is in water.

I was thinking yamaha engines automatically started peeing upon cranking the engine unlike mercury.

No reason to run the engine while on the flush port, you just need a little pressure to help push out the clog. The weedeater string will only go to the little 3 way fitting. The way it is oriented will not allow the string to bends around the corner and go any further. Pulling the hoses off that fitting have corrected my issue every time it has quit peeing. I have to do this process at least twice every summer since I bought the engine. It;s just squeeze type clamps so its very easy to pull the hoses off.