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How about before you do anything do a compression test?

That pic you put up is a looper intake not a crossflow intake. The OP has a crossflow which will have traditional carbs. So no it will not have adjustments.

Look for a silver disc on the block itself.

I would try a different prop first.

3 cylinder OMC I would look at the exhaust Cover. They are good for leaking water there.

You will have to google a little bit. High cliff/Sherwood Marina Jefferson Park Menasha Doty park Neenah. And there are other ones those are 3 to start with. And Oskosh itself will have a couple for sure along with Fon Du Lac

Your motor did not come with an airbox. Came like that from the factory there are no parts missing.

If you want to go faster buy a 77 or later 9.9 hp motor. It is a significant jump in power compared to the 9.5 hp. The 9.5 will never be the motor you want it to be.

That is a bad video that has nothing to do with a 25 hp Merc. Disconnect the black with yellow stripe wire from the cdi box.

If it wont rev above 3000 rpm I would do a spark test.

Your switch box is probably bad and probably always was.

My 6 vane housings have that Oring

edit

That motor should have a cap on the hood for 2 strk oil ONLY. The cap on the boat should have gas ONLY unless the oil injection doesn't work or has been disabled. If it has sat for a while take it to a competent Merc Mechanic who is familiar with the 2+2 motors.

They are mounted on the back of the motor on top. Should be a black box.

Check your relays. You probably have a bad one, or a bad switch

Ken Cook does all the Evinrude/Johnson manuals up to 2010. No Johnson or Evinrude exists anymore.

Looks like a comercial/export 6/7.5/8 hp from the 80s. Look at racers post,

Normal

Did the mechanic look at the accelerator pump?